文件后缀名大全_文件后缀.afd

.??_　Files ending in "_" are often compressed install files of the same
　　　　name (e.g., .EX_ expands to .EXE, .DL_ expands to .DLL, etc.)
.A　　UNIX Library　[UNIX]
　　　ADA Program
.A01　ARJ Multi-volume Compressed Archive (can be 01 to 99) (also see .000)
.A01 - .A10　OzWin CompuServe E-mail/Forum Access SYSOP File
.A06　Lotto Pro 2002 Smart Number Ticket
.A11　AIIM Graphic
.A31　Authorware 3.x Library
.A3D　Amapi 3D Modeling
.A3K　Yamaha A3000 Sampler File
.A3L　Authorware 3.x Library
.A3M　Unpackaged Authorware MacIntosh File
.A3W　Unpackaged Authorware Windows File
.A41　Authorware 4.x Library
.A4L　Authorware 4.x Library
.A4M　Unpackaged Authorware MacIntosh File
.A4P　Authorware File Without Runtime
.A4W　Unpackaged Authorware Windows File
.A51　Authorware 5.x Library
.A5L　Authorware 5.x Library
.A5W　Unpackaged Authorware Windows File
.A64　Artist 64　[XnView]
.A8　 Cubicomp PictureMaker 24bit 3D Animation (DOS-based animation program; graphics cards external to computer; Cubicomp closed 1990)
.A86　A86 Assembler Program File
.AA　 Audio Book File
　　　PROGNOSIS Automated Analyst Document File
.AAB　Macromedia Authorware Binary
.AAC　Advanced Audio Coding File
.AAM　Authorware Shocked File
.AAO　America's Army Map
.AAS　Authorware Shocked Packet
.AAT　Arcinfo Line Data Attribute Data (GIS-related file)
.AB　 Applix Builder File
.AB2　Parson's Address Book
.AB3　PhotoImpact Album File
.AB6　AB Stat Data
.AB8　AB Stat Data
.AB$　AutoCAD Spooled Plot File
.ABA　Palm Address Book File
.ABC　Flowchart
　　　Musical Notation Language File (folk melodies originally)
.ABD　AmBiz Bonus Calculator Data File
　　　Adventure Builder Database
.ABF　Adobe Binary Screen Font
.ABK　Corel Draw AutoBackup
　　　Any Automatic Backup
.ABL　Maxagrid Avails Data File (text format)
.ABM　HitPlayer Audio Album File
　　　Photo Impressions 2000 Album
　　　Album File (various)
.ABO　Applix Builder Turbo File
.ABR　Photoshop Brush
.ABS　Abstracts
　　　MPEG Audio Sound File　[MPEG]
　　　PC GNU Compiler Output
　　　Abscissa Data File
　　　Optocat　[XnView]
.ABT　The Arbiter Sports Official Schedule [Viewer]
.ABW　AbiWord Document File
.ABX　WordPerfect Address Book File
.ABZ　AbszOrb (textured spinning orb creator)
.AC　 CaseWare Working Papers Client File
.AC_　CaseWare Working Papers Compressed Client File
.AC$　AutoCAD Undo Info
.AC3　AC3 Audio File Format [DVD Maestro, DVD Conductor]
.ACA　MS Agent Character File
　　　Project Manager Workbench File
.ACB　ACBM Graphic Image
　　　AOL Cab Launcher (archived data file)
.ACC　DR-DOS Viewmax File
.ACD　Chromeleon Channel Raw Data
　　　Sonic Foundry Acid Music File
　　　allCLEAR Flowcharting File
　　　MS Agent Character Definiton File
.ACE　The Ace Archiver Compressed File
　　　Aces200　[XnView]
.ACF　MS Agent Character File
　　　Photoshop Custom Filter
.ACG　MS Agent Preview File
.ACH　Rockwell Software Logix 5 File
　　　Speccy Snapshot
.ACI　ACI Development Appraisal
.ACL　Corel Draw 6 Keyboard Accelerator
　　　MS Office AutoCorrect List
　　　ACL For Windows (data mining software)
　　　Access Control List
.ACM　Audio Compression Manager Driver (Windows)
　　　Photoshop Command Button
　　　Windows System File
　　　ACBM Image File
　　　Interplay Compressed Sound File
.ACO　Photoshop Color Swatch File
.ACP　MS Office Assistant Preview File [Buy Office XP at Shop.Microsoft]
　　　File Used by Adobe Acrobat Paper Capture
.ACQ　AcqURL File (bookmark manager)
.ACR　American College of Radiology File
　　　Dicom　[XnView]
.ACS　MS Agent Character File
.ACT　MS Office Actor Program File [Buy Office XP at Shop.Microsoft]
　　　FoxPro Documenting Wizard Action Diagram
　　　Photoshop Color Table
　　　Action! Presentation
.ACU　AppleLink-PE Compression Format (created by Floyd Zink; overtaken by Andy Nicholas' ShrinkIt; ShrinkIt should unpack)
　　　COBOL Intermediate Object File
.ACV　OS/2 Audio Drivers
　　　Photoshop Saved Curve　Also see
.ACW　MS Accessibility Wizard Settings
.AD　 AfterDark Screen Saver
　　　Ascend Password Protocol File
.AD!　OzWin CompuServe E-mail/Forum Access QS-Special - Get Marked Online
.AD2　2-bit Compressed Voice File
.AD3　3-bit Compressed Voice File
.ADA　ADA Program File
　　　ActiveDocs Answer Set
.ADB　ADA Package Body
　　　HP Organizer Appointment Database
.ADC　Chromeleon Demo Data File
　　　ActiveDocs Clipping Catalog
　　　Scanstudio 16-color Bitmap Graphic File
　　　Lingvo Dictionary Text File
.ADD　OS/2 Adapter Device Driver
　　　Adobe Pagemaker File
　　　Advantage Database Server Data Dictionary
.ADE　MS Access Project Extension [Buy Office XP at Shop.Microsoft]
　　　ADC Audio File
.ADF　Adapter Description File
　　　Admin Config File
　　　Amiga Disk File (Uncompressed 901120 byte DD Diskimage) [Amiga Forever]
　　　Dog Creek QC Mask File
.ADI　AutoCAD Plotter File
　　　Advantage Data Server Database Index File
.ADJ　LISCAD Plus Adjustment File
.ADL　QEMM MCA Adapter Description Library　[MCA]
　　　OzWin CompuServe E-mail/Forum Access QS-Special Get Marked
.ADM　After Dark Screen Saver Module
　　　Windows Policy Template
　　　Addict Compiled Dictionary
　　　Advantage Data Server Database Memo File
.ADN　1-2-3 Add-in Utility
　　　MS Access Blank Project Template [Buy Office XP at Shop.Microsoft]
.ADO　Photoshop Duotone Options
　　　Stata Program
.ADP　FaxWorks Modem Setup File
　　　Astound Dynamite File
　　　MS Access Project [Buy Office XP at Shop.Microsoft]
　　　AOLserver Dynamic Page File　[AOL]
.ADR　After Dark Random Screen Saver Module
　　　Address Plus Database
　　　Smart Address Address Book
　　　Address Book
　　　Opera Web Browser Bookmark File
.ADS　ADA Package Specification
.ADT　HP NewWave Card Application Data File
　　　Advantage Data Server Database File
　　　Lingvo Dictionary File
　　　AdTech Fax File
.ADV　GUS Virtual Device Driver
.ADX　Lotus Approach Index File
　　　Archetype Designer Document
　　　Dynazip Active Delivery Script
　　　Sega Dreamcast Audio File [Source of files]
.ADZ　GZ-Packed Amiga Disk File (see ADF) [Amiga Forever]
.AE　 SoftQuad Author/Editor File
.AEF　ELECTRICAL Designer
.AEH　iPer Advanced Embedded Hypertext
.AEP　ArcExplorer Project File
.AER　Adobe Atmosphere File　[As of Mar 2002 in beta]
.AEU　MS AutoRoute Express Europe Route
.AEX　PGP Armored Extracted Public Encryption Key　[PGP]
.AF2　ABC Flowchart (Now Micrografx FlowCharter)
.AF3　ABC Flowchart (Now Micrografx FlowCharter)
.AFC　Apple Sound File
　　　ArisFlow Commander File
.AFD　ArisFlow Diagram
　　　Prismo Graphics ActiveFile Data
.AFF　AnyForm Form
.AFI　Truevision Bitmap Graphic
.AFL　Lotus Font
.AFM　Outline Font Metric
　　　HP NewWave Cardfile Application
　　　LOUT File (High-Level Language For Document Formatting)
.AFP　Flowchart Symbol Palette
　　　Papyrus Document Storage Format
　　　Prismo Graphics ActiveFile Proxy
　　　IBM Transactional Data Format (Advanced Function Print) (AS400 computer)
.AFS　Filter Factory Photoshop Filter　[Added]
　　　Sega Dreamcast Compressed Audio
.AFT　Flowchart Template
　　　AnyForm Template
.AFW　Flowchart Work Area
.AFX　Auto FX Photographic Edges (Photoshop add-in)
.AG　 Applix Graphic
　　　Argus Spreadsheet File
.AG4　Access G4 File [Buy Office XP at Shop.Microsoft]
.AGF　Atlas GeoFile
.AGP　Aspen Graphics Pages
.AGW　Aspen Graphics Windows
.AHQ　AudioHQ Plugin Module
.AHS　Photoshop Halftone Screens
.AI　 Adobe Illustrator Vector Graphic [XnView]
　　　Corel Trace Drawing
　　　Progress Database After Image File
　　　Advantage Database Server File
　　　EARS Component File (EARS = UK Liberal Democrats Election Agents Record System) [Filename starts with E]
.AIF　Knowledgeware Setup Information
　　　Audio Interchange File　[IrfanView]
　　　SymbianOS Application Information File (set application properties)
.AIFC　Audio Interchange File　[IrfanView]
.AIFF　Audio Interchange File　[IrfanView]
.AIH　ArcView Optional Index File (GIS-related file)
.AIJ　Oracle After-Image Journal
.AIL　AutoImager File (batch image conversion)
.AIM　AOL Instant Messenger File　[AOL]
.AIML　Artificial Intelligence Markup Language
.AIN　AIN Compressed Archive
　　　ArcView Optional Index File (GIS-related file)
.AINSO　VAX CRYSTALS Chemical Crystallogaphy File
.AIO　APL File Transfer Format
.AIP　Audiosoft Parameter File
.AIQ　AzureIQ Client File (IT Audit Reporting)
.AIR　Align It! Resource File
　　　Flight Simulator Aircraft Performance Info File [Free Flight Dynamic Editor]
.AIS　Array of Intensity Samples (Graphic)
　　　Velvet Studio Instruments
　　　ACDSee Image Sequence File
.AIX　HP NewWave Cardfile Application Data
.AKF　Acrobat Key File
.AKW　RoboHELP Help Project Index File
.AL　 Oracle File (used for networking)
.ALA　Alan Adventure Language File
　　　Sharp Fax File (unverified)
.ALB　JASC Image Commander Album
　　　Steinberg Cubase or VST Backup Song File
　　　Photo Soap2 File
.ALBM　webAlbum Photo Album
　　　 HP Photosmart Photo Printing Album
.ALC　Norton Internet Security Ad Server File
　　　MP3 Embedded Dynamic Lyrics
.ALE　Avid Log Exchange
.ALF　Abacus Law File
　　　ALF Logic File ("Another logical framework"--structure editor for Martin-L鰂's monomorphic type theory)
　　　AdventNet Look and　Feel Standards (ALFSTANDARDS.ALF)
　　　Aventail Connect License File (AVENTAIL.ALF)
　　　VPCom Remote User Configuration File
　　　LANDesk Client Manager Configuration File
　　　ACT! User Logon Tracking
　　　Color Quick Label
　　　Cadence Ambit BuildGates
.ALI　SAP Proprietary Format Document File
　　　OM2 OMALI Native OMALI Document
.ALIAS　Alias Image　[XnView]
.ALL　Arts & Letters Symbols and Characters
　　　WordPerfect Printer Info
　　　Steinberg Cubase or VST Song File
　　　Always Working Page Format File
.ALS　Alias Image [XnView]
　　　Calmira Shortcut File
.ALT　WordPerfect Menu File
.ALV　Photoshop Levels
　　　Aladdin Knowledge Systems Vbox Available Languages File (software distribution)
.ALX　OM2 OMALI Plug-in Extension
.ALZ　ALZip Compressed File (Korean site)
.AM　 Applix SHELF Macro
　　　Advantage Database Server File
.AM2　AutoPlay Menu Studio Version 2
.AM3　AutoPlay Menu Studio Version 3
.AMB　Radiance Ambient File Format
.AMC　Ant Movie Catalog
.AMF　Advanced Module Format Music File
　　　DSMIA/Asylum Module Music
.AMG　AMGC Compressed Archive (alternate site)
　　　AMG ACTOR System Image
.AMI　Cocreate SolidDesigner Annotation File
　　　Amiga Paint　[XnView]
.AML　AutoMage (Automation/Macro Software)
.AMM　AMM File (pattern design pgm for Universal flat knitting machines)
.AMP　Photoshop Arbitrary Map Settings
.AMS　Extreme's Tracker Module Format
　　　Photoshop Monitor Setup
　　　Velvet Studio Module
.AMZ　The Amazon Trail Saved Game
.AN　 Groundworks Text File
.AN8　Anim8or 3D Animation
.ANC　Canon Computer Pattern Maker File
.ANF　AcuteNotes File (contains one or several notes order in a hierarchy)
.ANI　Animated Cursor　Microangelo　[IrfanView]
.ANL　Project Analyzer Saved Analysis
.ANM　DeluxPaint Animation
.ANN　Help Annotation
.ANO　Annotation File (often used with annotating PDF files)
.ANS　ANSI Graphic　[ANSI]
　　　MS Word Text and Layout [Buy Office XP at Shop.Microsoft]
.ANSR　AnswerTool File
.ANT　SimAnt for Windows Saved Game File
.ANV　AirNav [XnView]
.AOB　DVD Audio File (MPEG-2 program streams with additional info)
.AOF　Acorn Object Format (used for data storage)
.AOS　Nokia Add-on Software
.AOT　ZenWorks Application Binary Object Template File
.AP　 Applix Presents File
　　　Datalex EntryPoint 90 Data File
　　　WHAP-Compressed Amiga Archive
.APA　AlfaPad Organizer File
　　　ArcPad 6 Applet
.APC　Lotus Printer Driver Characters
　　　Centura Team Developer Compiled Application File
.APD　Lotus Printer Driver
　　　Centura Team Developer Dynamic Application Library File
.APE　Music Format [Many different players]
.APF　Lotus Printer Driver Fonts
　　　ArcPad 5 Profile
　　　Acrobat Profile File
　　　Homesite Project File
　　　Fax2000 File
.API　Lotus Printer Driver Info
　　　Photoshop Ink Colors Setup
　　　Application Program Interface
　　　Acrobat Plug-in
　　　1st Reader Passed Parameter File
.APIN　Adobe InDesign Import/Export Filter
.APJ　Angel Debug Monitor Project File (link is PDF file)
　　　Music Screen Saver File (usually associated with .SCR file)
　　　ARM Project Manager File
.APK　GameSpy Arcade Service
.APL　Centura Team Developer Application Library File
　　　ArcPad 6 Layer
　　　APL Workspace File
.APM　ArcPad 6 File
.APO　Apollo Scripts
.APP　R:Base, Symphony, DR-DOS, FoxPro (or other) Application
　　　Centura Team Developer Normal Mode Application File
　　　dBASE Application Object File
　　　ArcPad 5 Project
　　　SymbianOS Application
　　　CLARION for Windows Application
　　　Executable Application (under DR-DOS, NeXTstep, Atari)
.APR　Lotus Approach 97 File
　　　ArcView Project File (GIS-related file)
　　　Employee Appraiser Performance Review File
.APS　MS Visual C++ File
　　　ArcPad 5 Symbology File
　　　Advanced Patching Systems with Error Checking
.APT　Centura Team Developer Text Mode Application File
　　　Lotus Approach Data View File
　　　Nimbus 7 SAMS Data File (a-priori temperature profiles)
.APX　Lotus Approach Paradox-specific Information File
　　　Borland C++ Appexpert Database
　　　ArcPad 6 XML File
　　　Ability Photopaint Image [XnView]
.AQ　 Applix Data
.AR　 Compressed Archive File (used by MS Midtown Madness 1 & 2 games)
　　　Midtown Madness City Add-on
.ARA　ATI Radeon Video Driver File
.ARC　Archive File
.ARCHIMEDES　Speccy Snapshot
.ARF　Automatic Response File
.ARH　ArHymo Hydrologic Simulation ()
.ARI　Aristotle Audio File
　　　Compressed Archive
.ARJ　Compressed Archive (Stuffit can expand)
.ARK　Compressed Archive
.ARL　AOL Organizer File　[AOL]
.ARM　Armadillo Software Protection System
.ARN　Astronomical Research Network　[XnView]
.ARPX8　Techno Toys Arp-X8 MIDI Arpeggiator File
.ARQ　Compressed Archive (often on a Macintosh)
.ARR　Atari Cubase Arrangement
.ARS　Artifax Report Editor (SQL query tool)
.ART　Clip Art File
　　　Xara Studio Drawing
　　　Blood Archive　[Dragon UnPACKer]
　　　Duke Nukem 3D Archive　[Dragon UnPACKer]
　　　Canon Crayola Art File
　　　Another Ray Tracer Format
　　　AOL Johnson-Grace Compressed File　[AOL]
　　　First Publisher Raster Graphic
　　　PFS: Art Publisher　[XnView]
　　　Art Director Image　[XnView]
　　　Artisan　[XnView]
.ARV　Arsiv File
　　　AutoRoute User Information
.ARX　Compressed Archive
.ARY　Compaq SmartStart Scripting Toolkit File
.AS　 Applix Spreadsheet
　　　Macromedia Flash Action Script (include files when writing large scripts)
.AS3　Alternate Sources Data File [Warning: Link goes to a sexually-oriented site.]
　　　APL*PLUS II/386 and III/Windows Source Code
.AS4　AS/400 Client Access
.ASA　MS Visual InterDev File
　　　Active Server Document
.ASC　ASCII Text File　[ASCII]
　　　PGP Armored Encrypted File　[PGP]
.ASCX　Web User Control (part of MS .NET)
.ASD　MS Word Automatic Backup [Buy Office XP at Shop.Microsoft]
　　　Lotus Screen Driver
　　　MS Advanced Streaming Format Description File
　　　Astound Presentation
.ASE　Velvet Studio Sample
.ASF　MS Active Streaming (Media) File (contains audio and/or video compressed with 3rd party codecs)
　　　Statgraphics Data
　　　Lotus Screen Font
　　　APL*Plus/PC APL Shared File
　　　Electronic Arts Music File
.ASH　TASM Assembler Header
.ASI　Borland Assembler Include
.ASK　askSam Database
.ASM　Assembler Source Language (various)
　　　Pro/Engineer Assembly File
.ASMX　ASP.NET Webservices Source File
.ASO　Assembler Object
　　　Astound Dynamite Objects
.ASP　Active Server Page
　　　Procomm Plus ASPECT Program
　　　Astound Presentation File
　　　Photoshop Photo File Index
　　　Photoshop Separation Setup
　　　EROSION 3D Aspect File [Format (pdf)]
.ASPI　Audio Catalyst
.ASPX　ASP.NET Source File
.ASR　Ms Automap Route
　　　Photoshop Scratch Area
.ASS　Assembler/Disassembler 68HC11 File
　　　ASS I/O (programmers utility to pack multiple files into one file)
.AST　Astound Multimedia File
　　　Photoshop Separation Tables
　　　Claris Works Assistant File
.ASV　DataCAD Autosave File
　　　Photoshop Selective Color
.ASX　Metafile (points to an .ASF structured file)
　　　Cheyenne Backup Script
　　　Video File
.AT2　Aldus Persuasion 2.0 Auto Template
　　　DCX-AT200 Motion Control Command Language File
.AT3　DCX-AT3000 Motion Control Command Language File
.ATF　Photoshop Transfer Function
.ATK　Bitmap Image (Andrew Toolkit Raster Object file) [XnView]
.ATL　Hal/Supernova/Lunar/LunarPlus Screen Readers/Magnifiers
　　　PROGNOSIS Atlas Document File
.ATM　Adobe Type Manager Data File
.ATN　Adobe Photoshop Action File
.ATO　Just Burn File (audio CD burner on Compaq computers)
.ATR　Lightscape Material Library
.ATS　Attityd Swedish Survey Program
.ATT　AT&T Group 4 Bitmap (fax) [XnView]
.ATW　AnyTime Deluxe PIM File　[PIM]
　　　Attityd Swedish Survey Program
.ATX　A ZIP-formatted Compressed Archive (Use any ZIP program to open)
.AU　 Music File (various, usually Sun or UNIX)　[IrfanView]　[Linux Player]
.AUD　Audio File used by Westwood Studios for various games
.AUP　ePocrates File
.AUT　AutoIt Script (automate any windows based task)
　　　PocketWear Car Lease Kit Vehicle Data File (Pocket PC)
　　　TLG Workplace CD Search File
　　　Xitami Webserver Admin Password File (default.aut)
　　　GPSMan-autoMapic File (moving-map real-time plotting)
　　　Signwave Auto-Illustrator File
　　　Descent Manager Mission File
　　　Authentication File (various)
　　　Interactive Pictures iPIX Format
.AUX　TeX/LaTeX Auxilliary Reference File
　　　ChiWriter Auxilliary Dictionary File
.AV　 Final Draft AV Document File
.AVA　Avagio Publication
.AVB　Inoculan Anti-Virus Virus Infected File
　　　Avid Bins File
　　　Microsoft Chat Character File
.AVC　Kaspersky Antivirus Toolkit File
.AVD　Avery Label Pro Data File
.AVI　Audio Video Interleave File　[IrfanView]
.AVL　ArcView Theme Legend File (GIS-related file)
.AVP　ArcView Pallet File (GIS-related file)
　　　Avid Project File
.AVR　Audio Visual Research Sound File
.AVS　Animation File
　　　Application Visualization System Format
　　　Stardent AVS X Image　[XnView]
　　　Winamp Advanced Visualization Studio File
　　　Avid Settings File
.AVX　ArcView File (GIS-related file)
　　　Avid Extensions File
.AW　 HP AdvanceWrite Text File
　　　MS Answer Wizard File
　　　Applix Word File
.AWB　Lavasoft Ad-aware Backup File
.AWD　Faxviewer Document (AWD Microsoft Fax) [PolyView Viewer]
　　　Award BIOS File
　　　AWK Language Source Code File
.AWE　Adobe Acrobat Bookmark XML File
.AWF　Qui veut gagner des millions Archive　[Dragon UnPACKer]
　　　Who wants to be a millionaire Archive　[Dragon UnPACKer]
.AWK　AWK Script
.AWM　Animation Works Movie
.AWR　Telsis Digital Audio File
.AWS　StatGraphics Data File
.AWX　MS DirectX 8.1
.AX　 DirectShow Filter
　　　DivX MPEG-4 DVD Filter [some filters work with Windows Media Player]
.AXD　Avery Label Pro Re-Index File
.AXE　Paradigm C++ Integrated Debugger File
　　　ChordMaster (Chord Chemistry and Sequencing program for guitarists)
　　　MS Autoroute Export File
.AXG　MS Autoroute Trip File
.AXL　ArcIMS XML Project File　[XML]
.AXP　GraphStore eCADLite File
.AXR　Telsis Digital Audio File
　　　ElcomSoft Advanced Archive Password Recovery
.AXS　MindAvenue AXEL Stream File
.AXT　ZenWorks snAPPshot ASCII Application Object Template
　　　Photoshop Replace Color/Color Range
.AY　 AY Chip Sound File (chip used in ZX spectrum and other arcade machines)
.AZ　 WinDVD File
.AZZ　AZZ Cardfile Personal Information Manager
.B　　Limbo Implementation File (Inferno OS)
　　　Brainf*ck Program (small programming language)
　　　Befunge Program
　　　Applause Batch List
.B02　ADP Payroll (unverified)
.B16　PCO Graphic　[XnView]
.B1J　BookJones
.B1N　1st Reader Binary Screen Image
.B1S　BookSmith
.B30　Ventura Publisher Printer Font
.B3D　3D Builder File
　　　BDE Multipath Movie Digital Viewer
.B4　 Helix Nuts and Bolts File (Helix Software now part of McAfee)
.B5S　Numerical Controlled Machine File (Ball-bar?)
.B64　Base 64 MIME-encoded File　[MIME]
.B8　 Piclab Raw Graphic File
.B&W　Atari Black and White Graphics
　　　1st Reader Mono Binary Screen Image
　　　Image Lab　[XnView]
.B_W　Atari/Macintosh Black and White Graphic
　　　1st Reader Mono Binary Screen Image
　　　Image Lab　[XnView]
.BAC　Backup
.BAD　Rime Mailer Address File
　　　Oracle BAD File
　　　Brutus Application Definition File (password cracking)
.BAG　PMMail Mail Index File
　　　OS/2 Netfinity Manager Sysinfo File (adapter.bag)
　　　AOL Instant Messenger File
　　　Emperor: Battle for Dune Archive　[Dragon UnPACKer]
.BAK　Backup
.BAL　Ballade Music Score
.BAN　Sierra Print Artist Banner
.BAR　dBase Application Generator Horizontal Menu Object
.BAS　BASIC Language Source
　　　Basic Module
.BAT　Batch Processing (DOS Batch File)
.BB　 Papyrus Database Backup
　　　Blitz Basic File
　　　Starfleet Battles DOS Game
.BB2　XBBS-OS/2, XGROUP, AV and ZTree Archiver Control File
.BBC　BBC BASIC File
.BBL　TeX/BibTeX Bibliographic Reference File
.BBM　Deluxe Paint Image File
.BBMA　Bonzibuddy
.BBP　BitBeamer Split File (of the form .??_??.bbp)
.BBQ　BitBeamer Transfer Queue File
.BBS　Bulletin Board Sytem Text
.BC　 Sierra Print Artist Business Card
.BC3　Fiebdc-3 Format File (Format of Interchange ESTANDAR of Data bases of CONSTRUCTION)
.BCC　Calendar Creator 8 Collection
.BCF　ConfigSafe Snapshot Index
　　　The Sims (Maxis) 3D Body Mesh File
.BCH　dBase Application Generator Batch Process Object
　　　Datalex EntryPoint 90 Data File
　　　Phoenix Software (Datalex) Entry Point 90 Data File
.BCK　Backup
.BCM　MS Works Communications File
.BCN　Business Card Pro Design
.BCO　Bitstream Fontware File
.BCP　Borland C++ Makefile
.BCW　Borland C++ 4.5 Environment Settings
.BDB　MS Works Dababase File
.BDE　Borland Database Engine (embedded in many different programs)
.BDF　West Point Bridge Designer File
.BDF　Egret Data File
　　　X11 Bitmap Distribution Format
　　　Backup To CD-RW Backup Definition File
.BDG　Badge Designer 2000 Photo ID
.BDR　MS Publisher Border [Buy Office XP at Shop.Microsoft]
.BEC　Break Even Calculator
.BED　InfoSnorkel Blue Elephant Definition (define content InfoSnorkel extracts from web page)
.BEZ　Bitstream Fontware File
.BF　 Brainf*ck Program (small programming language)
　　　Befunge Program
.BF2　Bradford 2 Font
.BFA　Blowfish-encrypted File (Extension added to original) [Program List]
.BFC　Briefcase File
.BFF　AIX?Backup File Format
.BFFM　B17 Flying Fortress Game File (link is to support page)
.BFL　Colin McRae Rally 2 Data File
　　　BFLI　[XnView]
.BFLI　BFLI　[XnView]
.BFM　UNIX Font Metrics File
.BFX　BitFax Document
　　　BFX Bitware　[XnView]
.BG　 MS Backgammon for Windows Game
.BGA　OS/2 Graphic Array　[XnView]
.BGB　MS Chat Background Graphic
.BGI　Borland Graphic Interface
.BGL　Flight Simulator Scenery File
.BGM　Jane's Combat Simulations F-15
.BH　 BlackHole Archive Format File [ZipTV]
.BHF　pcAnywhere Host File
.BHTML　BabuHTML Embedded Software File (example use: netMailshar)
.BHX　Archive File
.BI　 Binary File
　　　Progress Database Before Image File
.BIB　Bibliography
　　　Papyrus Database
　　　TeX/BibTeX Literature Database
.BIC　Civilization III Scenario
.BID　BidMaker 2002 File (software to aid in making bids on jobs)
.BIE　JBIG File　[XnView]
.BIF　GroupWise Initialization File
　　　Image Capture Board Binary Black & White Image
　　　Baldur's Gate Archive　[Dragon UnPACKer]
　　　Planescape: Torment Archive　[Dragon UnPACKer]
.BIG　Chinese (old version)
　　　Cartes Michelin　[XnView]
.BIK　BioCharter Profile Backup File
　　　Bink Game Video File
.BIN　Binary File (many)
.BIO　BioCharter Profile File
　　　OS/2 Bios File
.BIT　Bitmap Image
　　　Worms Armageddon Imported Map
　　　Worms World Party Imported Map
.BIZ　Broderbund Print Shop Business Card File
.BJF　NTI Backup NOW! File
.BK　 Backup
　　　LinguAssist File
　　　JetFax Faxbook File
.BK!　Backup
.BK$　Backup
.BK?　Backup (Can be 1 to 9, usually with WordPerfect)
.BK1　Bach Preludes and Fugues MIDI akmi Source, Book 1
.BK2　Bach Preludes and Fugues MIDI akmi Source, Book 2
.BKF　Moto Racer Archive　[Dragon UnPACKer]
　　　MS WindowsXP Backup Utility (Note: This is default; can be renamed to any extension.)
.BKG　Background File (used in many games/programs)
　　　UWXAFS Binary Format Data File (absorption data on an energy grid which does not need to be evenly spaced)
.BKI　Backup Index
.BKP　Backup
.BKS　Bookshelf Backup
　　　IBM BookManager Read Bookshelf
　　　MS Works Spreadsheet Backup
.BKU　Timeslips Backup
.BKW　FontEdit Fontset Mirror Image
.BLA　Blat E-mail (command line E-mail tool written for Windows)
.BLB　DreamWorks Resource Archive
.BLD　BASIC Bload Graphics
　　　MegaPaint　[XnView]
　　　VersaPro Block Build Info
.BLEND　Blender 3D File
.BLG　Windows Binary Performance Log
　　　　(W-2000 & W-XP have different formats. To convert click.)
.BLK　WordPerfect Temp File
　　　Lightscape Block Library
　　　Alias Wavefront Image
　　　Amiga IFF　[XnView]
　　　VersaPro Block
.BLL　An extension used by the VBS/European-A worm. If found in the directory
　　　　C:\STARTUP suspect you are infected with this worm and have your computer
　　　　checked with anti-virus software!
　　　INPRISE Format Language Library (changed to .BTL)
.BLT　Wordperfect for DOS File
　　　Saved AIM Buddy List File
.BLZ　Bitmap Graphic
　　　Twinkle Bulbs Bulb File
　　　Emblaze.Creator File
　　　Blazon Heraldic Shield
　　　Serial Number File [IBM's Drive Fitness Test (DFT) program]
.BM　 Bitmap Graphic
.BM1　Apogee BioMenace Data File
.BMF　Corel Flow Image File　[XnView]
.BMI　Buzz Instrument
　　　Blue Martini Import File (eCRM)
.BMK　Help Bookmark
.BMP　Windows OS/2 Bitmap Graphics　[IrfanView]
.BMS　Backup Magic Backup Set
.BMU　Music/Sound File [Open with Winamp or other MP3 player]
.BMW　Buzz Music File with Waves
.BMX　Buzz Music File
　　　Siemens Mobile Phone Animation
.BMZ　Demon Stalkers: Raid on Doomfane (old game)
.BN　 AdLib Instrument Bank
.BNG　[Used by program RANGER.EXE] (Marshalling Yard Calculations)
.BNK　Adlib Instrument Bank
　　　SimCity Game File
　　　(reported to be) Bink Compressed Video/Audio File
.BNR　Binary News Reader File
.BNSKIN　Beatnik Clock Skin
.BOB　BobDown Downloading Program　[Also see Antibob]
　　　Bob Raytracer　[XnView]
.BOL　MS Booasm Compressed Archive Library
.BOM　Orcad Schematic Capture Bill of Materials File
　　　Softshare Delta Business Object Model
.BOO　Image File
　　　Book
　　　Compressed Archive File
.BOS　Brotherhood of Steel Compressed File (renamed ZIP file; use any extractor)
.BOT　Frogbot Editor (Frog = Quake add-on computer opponent)
.BOW　Back Orifice 2K Workspace [this is a hacking tool]
.BOX　Notes Mailbox
　　　Lemmings Revolution Archive　[Dragon UnPACKer]
　　　ThrottleBox Multimedia Viewer
　　　Aladdin Knowledge Systems Vbox Helper Application File (software distribution)
.BOXR　Boxerjam Interactive Game System
.BPC　Business Plan Toolkit Chart
　　　BuildPro File
.BPL　Delphi Library
.BPP　MUSICMATCH Burner Plus Project
.BPR　Borland C++ Builder 6 Project
　　　BackupXpressPro Project File
.BPS　MS Works Document
　　　Bulletproof FTP Settings
.BPT　Bitmap Master File
.BPX　Truevision Targa Bitmap　[XnView]
.BQY　BrioQuery File
.BR　 Bridge Script
　　　The Playa File (link is tentative)
.BR3　Bryce 3D Scene File (Bryce made by MetaCreations, changed to Viewpoint, product taken over by Corel)
.BR4　Bryce 4 File (Bryce made by MetaCreations, changed to Viewpoint, product taken over by Corel)
.BRC　Bryce 2 Scene File (Bryce made by MetaCreations, changed to Viewpoint, product taken over by Corel)
.BRD　EAGLE Board File
.BRI　Basic Rate Interface File
.BRK　Brooktrout Fax-Mail File　[XnView]
.BRO　Tree Professional Broadleaf Creator File
.BRP　Tree Professional Broadleaf Creator Image
.BRS　Corel Paint Classic File
.BRT　Brooktrout Fax-Mail File　[XnView]
.BRU　Brutus Restore File (password cracking)
.BRW　Application file associated with financial institution(s) loan applications
.BRX　Multimedia Browsing Index
.BRZ　DbBRZ File (Backup or Restore)
.BS　 Printfox/Pagefox　[XnView]
.BS_　MS Bookshelf Find Menu Shell Extension
.BS1　Apogee Blake Stone Data File
.BS2　Basic Stamp 2 Code File (WordPad or BS2-Editor)
.BSA　BSARC Compressed Archive
.BSB　SWAT Sub-basin Output File (river basin scale model)
　　　MapInfo Sea Chart
.BSC　Apple II Compressed Archive
　　　Source Browser Database
　　　Fortran Pwbrmake Object [FORTRAN]
　　　Boyan Script
　　　MS Developer Studio Browser File
.BSK　Bryce 4 File
.BSP　Quake Map
　　　Half-life/TFC/CS Map
.BST　BibTeX Style File
.BSU　Brindys BriTray (software update)
.BSV　BASIC Bsave Graphics
.BTAB　Base Guitar Tabulature [On-line Guitar Archive]
.BTL　INPRISE Format Language Library (changed from .BLL)
.BTM　4DOS Batch To Memory Batch File
.BTN　ButtonWare File
　　　JustButtons Animated Bitmap　[XnView]
.BTO　Baytex Organix! 2001 Language Kit
.BTR　Btrieve Database File
　　　MS Frontpage-related File [Buy Office XP at Shop.Microsoft]
.BTS　Creative Digital Blaster Digital VCR File
.BUD　Quicken Backup
.BUF　WinXL File　(Datascope emulation software)
.BUG　Bug (Problem) File
.BUL　Holiday Lights Screen Saver Bulb File
.BUM　Poser Bump　[XnView]
.BUN　CakeWalk Audio Bundle File
.BUP　Backup DVD Info File
　　　PC-Bibliothek Update File
　　　CD Indexer
　　　Brother Embroidery System File
　　　Softcode Tracker Contact Manager Backup (Australian software no longer sold)
.BUT　Buttons! Button Definition
.BUY　Movie Data File
.BV?　WordPerfect Overflow File (Can be 1 to 9)
.BVH　Biovision Motion File [Format] (Used by Poser and other software)
.BVS　BVS Solitaire Collection
.BW　 SGI Black and White Image
　　　Silicon Graphics Raw RGB File　[XnView]
.BWB　Visual Baler Spreadsheet File
.BWI　Blindread/Blindwrite
.BWR　Kermit Beware Bug List
.BWS　Blindread/Blindwrite
.BWT　Blindread/Blindwrite [Fantom CD Emulator]
　　　CDmage Table of Contents
.BWV　Business Wave File
.BXF　Man's Best Friend Software Breeder Exchange Format
.BXX　blaxxun Contact
.BYU　Movie File (Shockwave)
.BZ　 Bzip UNIX Compressed File (Open using WinRAR
.BZ2　Bzip UNIX Compressed File (Replaces .BZ) (Open using WinRAR
.BZF　Textures and Other Information (used by various games)
.C　　C Program File
　　　Check Point Site Configuration for Secure Remote
　　　UNIX Compact File Achive
　　　Desktop Color Separation Specification Cyan Layer (usually an EPS file)
.C??　Winace Compressed File (open with WinRAR)
.C++　C++ Source Code
.C--　Sphinx C-- Source
.C00　Ventura Print File
.C01　Typhoon Wave File
.C08　Lord Of Destruction Game File (unverified)
.C2D　IsoBuster File
　　　WinOnCd CD Image
.C3D　Chem3D Chemical File
.C3T　Chem3D Chemical Template File
.C4　 JEDMICS (Joint Engineering Data Management) DoD Engineering Data Format [For-pay Viewer]
　　　Edmics　[XnView]
.C4D　Cinema 4D (3D Modeling texturing and animation program)
.C6　 Ashlar-Vellum File
.C86　C86 C Program
.C--　Sphinx C-- Source code
.CA　 Telnet Server Initial Cache Data File
　　　DATAIR FlexPlus Data File
.CA1　OzWin CompuServe E-mail/Forum Access Catalog File
　　　STABCAL (stability calculation for aqueous systems) File
.CA2　STABCAL (stability calculation for aqueous systems) File
.CA4　Electronics Workbench Circuit
　　　STABCAL (stability calculation for aqueous systems) File
.CA7　Beta 44 Job File
　　　STABCAL (stability calculation for aqueous systems) File
.CAB　Cabinet File (Microsoft installation archive)
　　　Install Shield v5.x　or 6.x Compressed File (not compatible with MS .CAB files)
.CAC　dBase IV Executable File
.CAD　Softdesk Drafix CAD File
.CAF　Southern Company Terrestrial Data Acq
.CAG　MS Clip Gallery Catalog File
.CAL　SuperCalc Worksheet
　　　Calendar File
　　　HTML Calendar Maker Pro
　　　DOS Calendar Creator File
　　　Cals Raster File [SwiftView]
　　　Radiance Function File Format
　　　CALS Raster　[XnView]
.CALS　CALS Raster　[XnView]
.CAM　Casio Camera Graphic　[XnView] [IrfanView]
　　　Camtasia Project/Producer Files (screen recording editor)
.CAN　Canon Navigator Fax　[XnView]
.CAP　Ventura Caption
　　　Network Associates Sniffer Capture File
　　　Telix Session Capture
　　　Compressed Music File
.CAR　AtHome Assistant File
　　　Carrara Environment
　　　NeoBook Cartoon　[XnView]
.CAS　Comma-delimited ASCII File
　　　i2's Case Notebook Timeline Analysis
　　　Casio Program
.CAT　dBase Catalog
　　　Quicken IntelliCharge Categorization File
　　　Cognos Impromptu Database Report
　　　OzWin CompuServe E-mail/Forum Access Catalog File
　　　Photomatrix PhotoStudio Graphic　[XnView]
.CAZ　Computer Associates Archive
.CB　 MS Clean Boot File
　　　Crystal Button File
　　　Brief Macro Source Code
.CBC　CubiCalc Fuzzy Logic System File
.CBH　ChessBase Chess Database File
.CBI　IBM Mainframe Column Binary Formatted File
.CBL　COBOL Program
　　　Contextual Browsing Language Viewer (usually JavaApplet)
.CBM　XLib Compiled Bitmap
　　　Fuzzy Bitmap　[XnView]
.CBT　Computer Based Training
.CC　 C++ Program File
　　　Visual dBASE Custom Class File
　　　dB2K Custom Class File
　　　Picture Window's Color Curve File (ASCII text file)
.CC1　Chem3D Cartesian Coordinates 1
　　　Briggs Softworks Calendar Commander
.CC2　Chem3D Cartesian Coordinates 2
.CC5　Calendar Creator 5.x 6.x File
.CCA　CC:Mail Archive File
　　　Multimedia Fusion File (multimedia game creation)
.CCB　Visual Basic Animated Button Configuration
.CCC　Chat
　　　Curtain Call Native Bitmap Graphic
.CCD　CloneCd Related File [Fantom CD Emulator]
　　　Vector CAD Program File
.CCE　Calendar Creator 2 Event File
.CCF　OS/2 Multimedia Viewer Configuration File
　　　Symphony Communications Configuration File
　　　Remote Control File (various to include: ProtoProEdit, RAVedit)
　　　AudioReQuest Control File
.CCH　Corel Chart
　　　Fabasoft Components
.CCL　Intalk Communication Command Language
.CCM　Lotus CC:Mail Mailbox
.CCN　Vitalize! Game File　[Played via IE plug-in]
.CCO　CyberChat Data File
　　　XBTX BTX Graphics File
.CCP　C Converter Profiles (construction site management)
.CCR　Chat Room Shortcut
.CCS　CONKY CeZaR Stribas International
.CCT　Macromedia Director Shockwave Cast
　　　Logic Works Schematic File
　　　SIL Hebrew Font System Transliteration Table
.CCX　Corel Compressed Exchange File
.CD　 cdTree Content List
.CD1　DATAIR Cafeteria Document System Data File
.CD2　DATAIR Cafeteria Document System Custom Text File
.CDA　CD Audio Track
.CDB　Turbo C Database
　　　Clipboard File
　　　One Page from a ROM With a View Project File
　　　CardScan Database
　　　Nokia 9210/9290 Contact Database (Nokia runs Symbian)
　　　SymbianOS Contact Database File
　　　PowerDesigner Conceptual Model Backup File
.CDC　Chromeleon Driver Configuration Plugin
　　　Nero File (CD burning/design software)
.CDD　Chromeleon Device Driver
　　　Claris Draw v 1.2 Document
.CDE　Honeywell Hybrid Control Designer (HC900-x Industrial Controllers)
.CDF　Comma Delimited Format
　　　Cyberspace Description Format
　　　MS Channel Definition Format
　　　InstallShield Components Definition File
　　　NetCDF Graphic File
.CDG　DART Karaoke Studio CD+G File (contain only song lyrics and synchronization data)
.CDI　Phillips Compact Disk Interactive Format
　　　Disc Juggler File (CD-ROM data)
.CDJ　Disc Juggler File (CD-ROM data)
.CDK　Atari Calamus Document
.CDKEY　Protocol Used in Communicating from MediaRemote Server to PC MediaRemote Plug-in (ASCII text)
.CDL　CaseWare Working Papers Document Link
　　　SignLab Vector Graphic
.CDM　PowerDesigner Conceptual Model File
　　　Visual dBASE Custom Data Module
.CDP　CD/Spectrum Pro
.CDR　Corel Vector Graphic Drawing　[XnView]
　　　Raw Audio-CD Data
　　　Sound File [Linux Player]
.CDS　ChemDraw Stationery Document
.CDT　Corel Draw Template
　　　STABCAL (stability calculation for aqueous systems) File
.CDU　CDU Paint　[XnView]
.CDX　Compound Index [File Structure]
　　　Corel Draw Compressed Drawing
　　　MS Visual Foxpro Index
　　　Active Server Document
　　　ChemDraw Chemical Structure
　　　Microstation Cell Library Index
.CDXL　Old Amiga Movie Format
.CDXML　ChemDraw XML ChemDraw Format
.CDZ　ROM With a View Project File
.CE　 FarSide Computer Calendar File
　　　Computer Eyes, Digital Vision　[XnView]
.CE1　Computer Eyes, Raw　[XnView]
.CE2　Computer Eyes, Raw　[XnView]
.CE3　Calendar Creator 3.x 4.x Event List
.CEG　Continuous Edge Graphic
　　　Tempra Show Bitmap Graphic
.CEL　Autodesk Animator Graphic
　　　CIMFast Event Language File
　　　Kiss Paper Doll File
　　　Microstation Cell Library
　　　Kiss Cel　[XnView]
　　　Lumena CEL　[XnView]
.CEM　Empire Earth Game File
.CEN　Master Tracker Financial Analysis
.CER　Certificate File
　　　Sierra Print Artist Certificate
.CEV　Software License Tracking Tool (CERTAUTH.CEV)
　　　LOUT Character Encoding File (High-Level Language For Document Formatting)
.CEX　The Currency Exchanger Rate File
　　　INMOS Transputer Development System Occam User Program
　　　ThumbsPlus File (Progressive Multi-image JPEG file)
.CF　 Imake Configuration File
.CF4　Catfish File Manager Support File
.CFB　Comptons Multimedia File
.CFC　Cold Fusion File
.CFF　Capabilities File for FOUNDATION(tm) Fieldbus H1 (31.25 kbit/s)
.CFG　Configuration (various)
.CFH　Capabilities File for FOUNDATION(tm) Fieldbus HSE (100 Mbit/s)
.CFL　Corel Flowchart File
.CFM　Corel FontMaster
　　　Cold Fusion Template File
　　　Visual dBASE Windows Customer Form
.CFN　Atari Calamus Font Data File
.CFO　TCU Turbo C Utilities C Form Object
.CFP　Complete Fax Portable Fax File
.CFR　IBM Configurator Report (if you don't have the program ask the sender to export to .RTF for you)
.CFW　ChemFinder Form
.CGA　Ventura CGA Screen Characters
.CGI　Common Gateway Interface Script
.CGM　Computer Graphics Metafile
.CGP　NetCaptor CaptorGroup
.CH　 Clipper Header
　　　OS/2 Configuration File
.CH3　Harvard Chart (Harvard Graphics taken over by Serif)
.CH4　Charisma 4.0 Presentation
.CHA　Adobe Pagemaker Kerning Data
.CHAT　PIRCH98 Chat File
.CHD　FontChameleon Font Descriptor
　　　ChartFX File
.CHF　pcAnywhere Remote Control File
.CHI　Chiwriter Document
　　　Help File Index (typically used when the Help file will stay on a CD-ROM -- .CHI speeds access to the info)
.CHJ　Help Composer Project
.CHK　CHKDSK/SCANDISK Output
　　　WordPerfect Temp File
.CHL　Chromeleon Channel Raw Data
　　　Configuration History Log
.CHM　Compiled HTML Help
　　　ChemDraw Chemical Structure (old format)
.CHN　Ethnograph Data File
.CHP　Ventura Publisher Chapter
.CHQ　Help Combined Full-text Search File (produced when multiple .CHM files are merged)
.CHR　Character or Font File
.CHS　Corel WP Chart Style
　　　ATI Radeon Video Driver File
.CHT　Cheat Machine Data File
　　　ChartViewer dBase Interface File
　　　Harvard Graphics Vector File (Harvard Graphics taken over by Serif)
　　　ChartFX Template File
.CI　 CitectSCADA File
.CIF　Ventura Chapter Information
　　　CalTech Intermediate Graphic
　　　Easy CD Creator Image
　　　pcAnywhere Caller File
　　　Ventura Converted Image File
　　　Colombo Ipermedia File
　　　Chip Layout Information
　　　Crystallographic Information File
.CIL　Clip Gallery Download Package
.CIM　Sim City 200 File
　　　CompuApps Drive Backup Image
　　　CIMEX Cimpack Design Drawing File
.CIN　OS/2 Change Control File
　　　Cinetitler Digital Screen Subtitling
　　　Kodak Cineon　[XnView]
.CIP　Ghost Keylogger File
.CIR　SuperMax E-CAD Save-File Command
　　　PSpice File
　　　Flash Color Table
.CIS　CheckInbox File
.CIT　Intergraph Scanned Image　[XnView]
.CIX　TCU Turbo C Utilities Database Index
.CK1　iD/Apogee Commander Keen 1 Data File (.CK1 to .CK6)
.CKB　Borland C++ Keyboard Mapping File
.CKD　CADKEY GraphX File Format (ver 2 and above)
.CKP　Ingres Checkpoint File
.CKT　Crocodile Clips (Electronic design/physics)
.CL　 Generic LISP Source Code
.CL3　Easy CD Creator Layout File
.CL4　Easy CD Creator Layout File
.CL5　Easy CD Creator Layout File
.CLA　Java Class File (usually .CLASS but can be shortened)
　　　CLARION for DOS
.CLASS　Java Class File
.CLB　ICQ Contact List
　　　MS Office XP Developer Code Librarian
　　　cdrLabel Compact Disc Label
.CLF　ListPro File
.CLG　Disk Catalog Database
　　　Maxagrid CTM Log File (text format)
.CLK　Corel R.A.V.E. Animation File
.CLL　Crick Software Clicker File
　　　OzWin CompuServe E-mail/Forum Access Custom Library Search
.CLO　Cloe Ray-Tracer　[XnView]
.CLOE　Cloe Ray-Tracer　[XnView]
.CLP　Windows Clipboard/Picture　[IrfanView]
　　　Quattro Pro Clip Art
　　　CLIPS/wxCILPS File (C Language Integrated Production System)
　　　Clipper 5 Compiler Script
　　　PC Paint/Pictor Page　[XnView]
　　　GoDot　[XnView]
.CLR　WinEdit Colorization Word List
　　　1st Reader Binary Color Screen Image
　　　PhotStyler Color Definition
　　　FileMaker Spelling Dictionary
.CLS　Visual Basic Class Module
　　　C++ Class Definition
.CLV　Aladdin Knowledge Systems Vbox Current Language File (software distribution)
.CLW　Microsoft Visual C++ Class Wizard File
　　　CLARION Database (DOS & Windows) [CLARION Magazine]
.CM　 Craftman Data File
.CM2　Curious Labs Poser Camera File
.CM4　ClipMate Data File
.CMA　Applix TM1 Database File (text)
.CMB　Chromeleon Backup Archive
.CMC　PowerFront File　(part of ShopMind)
.CMD　OS/2, WinNT Command File
　　　DOS CP/M Command File
　　　dBase II Program File
　　　1st Reader External Command Menu
.CMF　Creative Music File
　　　Corel Metafile
.CMG　Chessmaster Saved Game
.CMK　Card Shop Plus File
.CML　Cheat Machine Library File (Windows)
　　　PADGen Company Info File
.CMM　CEnvi (ScriptEase:Desktop) Batch File
.CMO　Virtools Behavioral Server Composition
.CMP　Leadview Bitmap
　　　Discorp CMP Image　[XnView]
　　　Open Access File
　　　Address Document
　　　JPEG Bitmap
　　　CorelDRAW Postscript Printer Header
　　　Route 66 Address Document
　　　MS Word for DOS User Dictionary
.CMQ　Culturemetrics (Personality Profile Analyser)
.CMR　MediaPlayer Movie
.CMT　Culturemetrics (Personality Profile Analyser)
　　　Chinon ES-1000 Digital Camera　[XnView]
.CMU　Carnegie Mellon Univeristy Stereo Raster Image
　　　CMU Window Manager　[XnView]
.CMV　Corel Move Animation
.CMW　MS Custom Maintenance Wizard File
　　　COM-Watch (data analyser)
.CMX　Corel PhotoPaint Image　[XnView]
　　　Corel Presentation Exchange Image　[XnView]
　　　The Sims (Maxis) 3D Body Mesh Data
　　　Apple Viewer File
.CNC　CNC General Program Data
　　　Click 'n Create File
.CND　ControlDraw File
　　　Embroidery Design File [possibly read with Melco Sizer Software]
.CNF　Configuration (various)
　　　SpeedDial
.CNM　Windows Application Menu Options and Setup File
.CNQ　Compuworks Design Shop File
.CNREG　EULANDA?Warenwirtschaft (ERP) Configuration Information
.CNREP　EULANDA?ERP System Report Template
.CNS　W2K Client Connection Manager Export File
.CNT　Help File Contents (and other contents needs)
.CNV　MS Word Data Conversion File
　　　WS_FTP Pro Upload Conversion File Data
　　　WordPerfect Temporary File
　　　Canvas versions 6, 7, 8
.CO　 Cult3D ActiveX Player Application
.COB　COBOL Program File
　　　Caligari Truespace Format
　　　TrueSpace2 Object
.COD　Code List
　　　Compiler Program Code
.COD　Multiplan Data File
　　　dBase Template Source File
　　　SWAT Input Control File (river basin scale model)
　　　FORTRAN Compiled Code　[FORTRAN]
　　　Video Text File
.COK　Carmageddon Patch File
.COL　Autodesk Color Palette
　　　Multiplan Spreadsheet
　　　Lotus Notes Import Column Description File
.COM　Command (Executable file)
.COMPAT　Likely a text file (e.g., README.COMPAT)
.CON　Knowledgeware Consolidation File
　　　Tree Professional Conifer Creator File
　　　Simdir Configuration File
.CONF　IRC Related Configuration File (IRCDs or EggDrops)
　　　 Linux Configuration File (also UNIX)
.CONFIG　MS .NET Application Configuration Information
.COO　Fabasoft Components
.COP　Tree Professional Conifer Creator Image File
.COR　Protein Structure File
　　　Web GPS Correction Server Export File
　　　WMOVIEC Input File
.COS　Scarlett Expert System Compiler Query File (Scarlett is not presently available)
.COV　Fax Cover Page (Win2000 Cover Page Editor)
.CP　 CompuMedic Database (medical billing software)
.CP8　CP8 256 Gray Scale Image　[XnView]
.CPA　Colasoft Capsa (network sniffer)
.CPD　Fax Coversheet
　　　Corel PrintOffice File
　　　Complaints Desk Script
.CPE　Fax Coversheet
.CPF　Complete Fax File
.CPG　3dize® Cool Page File
.CPH　Corel Print House Image
.CPI　Code Page Information
　　　ColorLab Image
　　　Calamus　[XnView]
.CPJ　CeQuadrant CD Project
　　　Commotion File (compositing software tool)
.CPL　Control Panel Extension
　　　Corel Color Palette
　　　Compel Presentation
.CPN　Age of Empires II Campaign File
.CPO　Corel Print House File
.CPP　Borland C++ Builder 6
　　　CA-Cricket Presents Presentation
　　　Maya File
.CPR　Corel Presents Presentation
　　　Knowledge Access Graphics
　　　INMOS Transputer Development System Occam Program Code Fold
.CPS　Antivirus Checksum File
　　　Central Point PC Tools Backup
　　　Colored PostScript File
　　　Classroom Performance System File
.CPT　Macintosh Compressed File
　　　Corel Photo-Paint Image　[XnView] [IrfanView]
　　　Jasc After Shot (Image Expert 2000 taken over by Jasc from SierraImaging)
　　　dBase Encrypted Memo
　　　CA Cricket Presents Template
.CPT6　Corel Photo-Paint Image　[IrfanView]
.CPX　Control Panel Applet
　　　Code Page Translation File
　　　CryptaPix Encrypted Image
　　　Corel Presentation Exchange Compressed Drawing
.CPY　Copy Books Data File
　　　Atari Ramdrive CPY Commands
　　　Flexus COBOL Definitions (function, element and value properties associated with a control)
.CPZ　COMPOZ Music Text
.CR　 CRiSP Source Code
.CR2　Curious Labs Poser Character File
.CR4　STABCAL (stability calculation for aqueous systems) File
.CR7　STABCAL (stability calculation for aqueous systems) File
.CRA　Personal Craft Factory File (no longer supported--GraphicCorp bought by Corel)
.CRD　Cardfile (Windows 3.x Database)
　　　Guitar Chord File [On-line Guitar Archive] (Usually an ASCII text file)
.CRF　Zortech C++ Cross-Reference File
　　　Database Cross-Reference File
　　　OM2Cipher Recipient File
　　　Sierra Print Artist Craft
　　　System Shock 2 Archive　[Dragon UnPACKer]
　　　Thief 2: The Metal Age Archive　[Dragon UnPACKer]
　　　Thief: The Dark Project Archive　[Dragon UnPACKer]
.CRG　Calamus　[XnView]
.CRH　MS Golf Image File
　　　Links Games Course File
.CRK　Crack File (differences between original and cracked files) [Need proper version of CRK.EXE to open]
.CRL　Certificate Revocation List
.CRM　Capital Research Vendor Bid System
.CRP　dBase Encrypted Database
　　　Visual dBASE Custom Report
　　　Corel Presents Run-Time Presentation
.CRS　WordPerfect 5.1 for Windows File Conversion Resource
　　　Links Games Course File
　　　Gold Game Course File
.CRT　Certificate File
　　　Oracle Terminal Settings Info
　　　UNIX Crontab File (not a required extension for Crontab)
.CRU　CRUSH Compressed Archive
.CRW　Canon Raw Format (Image)　[XnView] [ACDSee 4.0]
.CRX　Links Games Course File
.CRY　Crypto Chat II Encrypted Notebook-content
.CRZ　Links Games Course File
.CS　 C#.NET Source File
.CSA　Comma Deliminated Text
　　　Ultimate Ride Roller Coaster
.CSB　Corel Photo-Paint Script
　　　CircuitSoft Viewer (a module of EMSI Complete) - (Unverified)
.CSC　Corel Script
.CSD　Bitstream Fontware File
　　　Chemsoft?MSDS Database File
　　　Embroidery Design File [possibly read with Melco Sizer Software]
.CSF　Van Dyke's CRT/SecureCRT Script File
　　　GeoMedia Coordinate System File
.CSG　Statistica Graph File
.CSH　Hamilton Labs C Shell Script File
.CSI　Cyberautograph Signed Item
.CSK　Claris Works
.CSM　Borland C++ Symbol File
　　　Borland C++ 4.5 Precompiled Header
　　　Kodak DC265 Camera Script
.CSN　Dreamweaver MX's Snippet
.CSP　PC Emcee On-Screen Image
　　　CaseWare Working Papers Script Page
.CSQ　Foxpro Queries
.CSS　Hypertext Cascading Style Sheet
　　　Stats+ Datafile
　　　Statistica Datasheet
.CST　Macromedia Director Cast File
.CSV　Comma-Separated Variables
　　　CompuShow Adjusted EGA/VGA Palette
.CT　 Scitex CT Handshake Bitmap　[XnView]
　　　Iris CT Graphic　[XnView]
.CT0　Maxagrid CTM File Being Processed (text format)
.CT1　Maxagrid CTM File Successfully Processed (text format)
.CT2　Maxagrid CTM File Unsuccessfully Processed (text format)
.CTB　NoteTab Clipbar
.CTC　PC Installer Control
.CTD　Cobra Track Dump (COmBined Reconstruction for Atlas)
　　　Cardtable File (text file)
　　　Marine Data File (e.g., automatic float data)
　　　Simpsons Cartoon Studio Export File
.CTF　TIFF Compressed File
　　　WhereIsIt Catalog
　　　Symphony Character Code Translation
　　　MGI PhotoSuite 1.0/8.0 Album File
　　　Calculator Text Format
.CTG　Cartridge Definition File
　　　ChessBase Opening Book
　　　Canon Powershot Pro 70 Info File
.CTL　Setup Information (various)
　　　User Control (various)
.CTM　FreeBSD Content Management File
　　　Java Charge Transaction Matrix File
　　　Crazytalk Talking Animation File
　　　Maxagrid CTM File (text format)
　　　SDR99 Speech Recognition Task Time Marked Conversation Input
　　　Content Delivery Service　(Web site pending as of Feb 2002)
.CTP　American Greetings Greeting Cards
　　　ChemDraw Template
.CTT　Hotmail List of E-mail Contacts
　　　LabView File
.CTX　Compressed Text
　　　Visual Basic User Control Binary File
　　　Pretty Good Privacy (PGP) Ciphertext File
　　　MS Online Course Text
　　　Chinese Character Input File
.CTY　SimCity City File
.CUB　OLAP Cube File (definition for SQL Server, any OLE DB, or ODBC-compliant database)
.CUE　MS Cue Cards Data
　　　Description File for a CD-Image [Fireburner.com or Goldenhawk.com] or [Fantom CD Emulator]
.CUF　Turbo C Utilities Form Definition
.CUL　IconForge/ImageForge Cursor Library
.CUP　OzWin CompuServe E-mail/Forum Access Catalog Library Update
.CUR　Cursor　Microangelo　[IrfanView]
.CURSOR　Sun Icon/Cursor　[XnView]
.CURXPTHEME　Cursor XP File (changes look & function of mouse cursor)
.CUT　Dr. Halo Bitmap Graphic　[XnView]
　　　INMOS Transputer Development System Occam Utility Package
　　　Utilitaires (multiple utilities)
.CV　 Corel Versions Archive
　　　MS CodeView Information
.CV4　Codeview Colors
.CV5　Canvas version 5
.CVA　Compaq Diagnostics
.CVG　Image File
.CVP　WinFax Cover Page
　　　Portrait　[XnView]
.CVR　WinFax Cover Sheet
　　　ElectraSoft Fax Cover Sheet
.CVS　Canvas Drawing File
　　　Outlook Express File
　　　Sound File [Linux Player]
.CVT　dBase Converted Database
.CVW　Codeview Colors
.CW3　Crossword Construction Kit Puzzle Group
　　　Claris Works Win 3 Document (now Filemaker)
　　　Chem Draw Molecular Structure　(Lewis structures, orbitals and lab apparatuses)
.CWB　WebNote Document
.CWD　StarDraft CWAD File (StarCraft Editor)
.CWE　Crossword Express
.CWK　Claris Works Data also see AppleWorks
.CWS　Claris Works Template also see AppleWorks
.CWW　Crossword Weaver File
.CXE　Common XML Envelope
.CXT　Macromedia Director Protected Cast File
　　　Vegas Jackpot Gold Game Data File
.CXX　Zortech C++ Program
.CYN　Cynex Root55 Program Extension
.CYP　Cypherus Encrypted Archive
.D　　Dialect Source Code File
　　　D Programming Language Source Code File
.D_1　Polytext Ma'archot Meida Co. S"TaM ("Sifriyah Toranit M'muchshevet" - Computerized Torah Library)
.D_3　Polytext Ma'archot Meida Co. S"TaM ("Sifriyah Toranit M'muchshevet" - Computerized Torah Library)
.D$W　MindStor Driver (digital wallet)
.D00　Ganbatte! Winamp Plug-in
.D01　Ganbatte! Winamp Plug-in
　　　　Note: .D00 and .D01 formats created by Jens-Christian Huus
　　　　　　　of the Vibrants and contains OPL2 music data.
.D11　Macro Mania Data File

.D2D　3D Fassade Plus 2D/3D Object File
.D2I　Shadowmaster Diablo II LOD Character Editor File
.D2S　Diablo II Character and Equipment File
.D2V　DVD Ripper File
.D3D　CorelDream 3D File
　　　Direct3D File
.D3F　MS MechCommander 2 Encyclopedia
.D64　Commodore 64 Emulator Disk Image
.D8A　AmBiz Productivity Pak Catalog
.DAD　Chromeleon Channel Raw Data
.DAF　OM2 911 Xchange Version 3 & 6 Document
.DAN　ATI Radeon Video Driver File
.DAO　Windows Registry Backup
　　　IsoBuster File
.DAP　Omnis5 Application File
　　　MS Access Data Access Page [Buy Office XP at Shop.Microsoft]
.DARBY　TheWord & Bible Companion Darby's Bible Translation Bible
.DAT　Data (multiple programs)
　　　　Note: RDXR020305.DAT is Morpheus adware. Kill this and others with Ad-aware.
　　　WordPerfect Merge Data
　　　(also possibly) MPEG File
　　　Mitsubishi DJ-1000 and Photorun Native Format
　　　Gunlok Archive　[Dragon UnPACKer]
　　　Nascar Racing Archive　[Dragon UnPACKer]
　　　SPOT Graphic　[XnView]
　　　SHARP MZ-series Emulator RAM-Disk File
.DAWN　Experimental File Format (.DAWN)
.DAZ　Poser 3D File
.DB　 Paradox Database
　　　Progress Database
　　　Solid Database
　　　WindowsXP Thumbnail Database
　　　ANSYS Database
　　　SmartWare Office Pac File (requires login)
　　　Oracle Database
.DB$　dBASE Temporary File
　　　Clarion Modula-2 Debug Info
.DB2　dBase II File
.DB3　dBASE III File
.DBA　DataEase Data File
　　　DarkBASIC File
.DBB　ANSYS Database Backup
　　　Mopheus Music File
.DBC　MS Visual Foxpro Database Container
　　　PROGNOSIS Database Collection Document File
.DBD　Clarion Modula-2 Debug Info
　　　Business Insight Data
　　　Oracle Record Type
.DBF　Database (multiple programs) [started as dBASE] [File Structure]
　　　Oracle 8.x Tablespace File
　　　ArcView Shape File (GIS-related file)
.DBG　MS C++ Symbolic Debugging Info
　　　Oracle Generator File
.DBI　Photo Soap2 File
.DBK　dBase Database Backup
　　　Orcad Schematic Capture Backup File
.DBL　WindowsXP Product Activation File (if on WPA.DBL in the System32 folder)
.DBM　Cold Fusion Template
　　　DataBoss Menu Template
　　　DataEase Data File
　　　OzWin CompuServe E-mail/Forum Access SYSOP File
.DBO　dBase IV Compiled Program File
.DBOOK　Pocket Diary Text
.DBQ　Paradox Memo
.DBR　Comdial VMMI Database
.DBS　SQL Format Database
　　　Word Printer Description File
.DBT　Database Text File [dBASE] [File Structure]
　　　Oracle Template
　　　Foxbase Memo
.DBV　Flexfile Memo Field File
.DBW　DataBoss Database File
.DBX　Database (multiple programs)
　　　DataBeam Image
　　　MS Visual Foxpro Table
.DC　 DesignCAD CAD File
.DC2　DesignCAD CAD File
　　　Kodak DC25 Digital Camera File
　　　DC2-PC Motion Control Command Language File
.DC5　DataCAD Drawing File
.DCA　Visual Basic Active Designer Cache
　　　IBM DisplayWrite Document Content Architecture Text File
　　　D-PAS Portfolio Manager File [Education about D-PAS]
.DCB　Concordance Database Control Block
.DCD　Document Content Description File
　　　FORTRAN Data File　[FORTRAN]
　　　INMOS Transputer Development System Occam Object Code
.DCF　Design Rule for Camera File Systems File
　　　DynSite Configuration File
　　　Dyadic Data File
　　　Disk Image File
.DCL　DumpSec
　　　DesignComposer Addition to Layout Knowledge Base
.DCLST　DC and DC++ Direct Connect [File sharing network using DC++]
.DCM　DCM Module Format
　　　Dicom　[XnView]
.DCP　Delphi Compiled Packages
　　　OS/2 Data CodePage
.DCR　Shockwave File
　　　Kodak Proprietary Image Format
.DCS　Quark Desktop Color Separation Specification
　　　ACT! Activity Data File
.DCT　Dictionary (various)
　　　MS Visual Foxpro Database Container
.DCU　Delphi Compiled Unit
.DCV　DriveCrypt Volume
.DCW　Draft Choice for Windows
.DCX　FAX Image　[IrfanView]
　　　ElectraSoft Fax
　　　PC-Paintbrush File [SwiftView]
　　　Bitmap Graphics　[IrfanView]
　　　Macros
　　　MS Visual Foxpro Database Container
.DD　 Macintosh Compressed Disk Doubler Archive
　　　C64 Doodle　[XnView]
.DDB　Device-Dependent Bitmap Graphics File
　　　Design Database File (database definition file) [MS Access???]
　　　INMOS Transputer Development System Occam Debugging Info
　　　Protel 99SE Design Database File
.DDATA　Pocket Diary Text File
.DDE　Dynamic Data Exchange
.DDF　BTRIEVE Data Dictionary File (allows other programs to access data)
　　　Bitstream Fontware File
　　　Doom Definition File
　　　Music Library File
.DDI　DiskDupe Image
　　　Disk Doubler Image
.DDL　MS Data Definition Language File (SQL Server Query Analyzer)
.DDM　Intelliware Data Modeller (Data Mapping and Aliasing)
.DDP　OS/2 Device Driver Profile File
　　　Delphi 6 File
.DDS　INMOS Transputer Development System Occam Compiler Descriptor
　　　Photoshop Compressed Textures
.DDX　Juno "Get" File
　　　Device Data Exchange Format File (text CAD design exchange format)
.DDW　CSPro File (combined IMPS and ISSA Census Processing System)
.DE　 MetaProducts Download Express Incompletely Downloaded File
.DEB　DOS Debug Script
　　　Debian Linux Package
.DEC　VersaPro Declaration File
.DESK　Card Deck File
.DESKLINK　MS Windows Explorer Desktop Controls
.DEF　Definitions
　　　Defaults
　　　SGML Tag Definition
　　　Modula-2 Definition Module File
　　　SmartWare II Data File
　　　C++ Definition
　　　3D Fassade Plus Define Module File
　　　Geoworks Assembly Header File
.DEI　Gerber Design Engineered Interface
.DEL　Data
.DEM　Descent Demonstration
　　　USGS Map
　　　Digital Elevation Model File (GIS-related file)
　　　Half-life Game File
.DEP　Setup Wizard Dependency
.DEPLOY　DeployMaster Setup Script
.DER　Certificate File
.DES　Description Text
　　　Tribes 2 Game File
　　　Quickbooks Template
　　　Pro/DESKTOP File
　　　Interscope BlackBox File (encryption program)
.DEU　ATI Radeon Video Driver File
.DEV　Device Driver
　　　Device Independent TeX
　　　LaTeX File
.DEX　WinGlucofacts File (diabetes management software)
.DEZ　DES Encrypted Zip File
.DF　 Lightscape Parameters
.DF1　Omnis7 and Omnis Studio Database File (also .DF2, .DF3, etc.)
.DFC　Voicemail File (Trio Voice Communications and maybe others)
.DFD　File Flow Diagram Graphic
.DFF　Digital Animation Format
　　　Grand Theft Auto 3 Export Format
.DFI　Digifont Outline Font Description
.DFL　Signature Default Program Settings
.DFM　Borland C++ Builder 6 Form
　　　Borland Delphi Form
　　　File Flow Diagram Model
.DFP　Stabilogram Diffusion Analysis File (Requires MatLab)
　　　Digital Fusion Plug-in
.DFS　Delight Sound File
.DFT　Fakt2000 File
　　　SolidEdge CAD File
　　　Workshare Synergy File
　　　PC Draft File
.DFV　Word Print Format Template [Buy Office XP at Shop.Microsoft]
.DG　 Autotrol Graphics
.DGC　TurboTax-related File
.DGK　Delcam Powershape/Powermill (3D CAD)
.DGN　Microstation CAD Drawing File
　　　Intergraph Graphics
　　　Dragon 32 Emulator
.DGO　Dimitrius Settings File (Dimitrius is program author)
.DGR　Fax Page (MS Outlook Express)
　　　DART Pro 98 File Group Details
　　　Keeptool ER Diagrammer
.DGS　AT Advanced Diagnostics File
.DH　 Geoworks Dependency Information File
.DHE　MS Help Workshop Dialog Box Help Editor Document
.DHP　Dr. Halo PIC
.DHT　Gauss Data File
.DIA　Computer Support Corp Diagraph Graphics File
　　　DIA Drawing
.DIB　Device-Independent Bitmap Graphic　[IrfanView]
.DIC　Dictionary (various)
.DIF　Data Interchange Format
　　　DIFF Command Output (patch script)
.DIG　Text Document
　　　Digilink Format
　　　Sound Designer Audio File
.DIL　DesignComposer Input DIL Script
.DIN　DataEase File
　　　ADC Labs eWave File (broadcast automation software)
.DIP　Graphics File
.DIR　Procomm Plus Dialing Directory
　　　Macromedia Director File
　　　DEC VAX Directory
　　　Worms Armageddon Archive　[Dragon UnPACKer]
.DIS　DKB Ray Tracer File　[XnView]
　　　DATAIR Data Import Specification Layout File
　　　VAX Mail Distribution File
　　　Corel Draw Thesaurus
.DISCO　MS .NET Web Service Discovery File
.DIT　MS Win2000 Active Directory Schema
.DIVX　Movie Encoded with DivX-codec
.DIZ　Description In Zip File
.DJE　MattBatt iAM-player
.DJV　DjVu File　[XnView]
.DJVU　DjVu File　[XnView]
.DKB　DKBTrace Ray-Traced Graphics File
.DL　 Animation File (this appears to be associated with glifomon.zip, a probable porno file)
　　　Masked .DLL File (often used by malware to hide .DLL files from virus scanners [e.g., Sub7])
.DL_　Compressed .DLL File in an Install Archive
.DL4　Lindab Dimsilencer File
.DLC　Echelon HQ Configuration File
　　　Model Dislocation File
　　　3D Studio Max Animation Controller File (Character Studio)
.DLD　Lotus File
.DLE　Macromedia Designer 3D Translator File (Also 3D Studio Max)
.DLF　Belkin Router Firmware Update
.DLG　Dialog Resource Script
　　　C++ Dialogue Script
　　　Infinity Engine Game Dialog File
　　　Digital Line Graph (U.S. Geological Survey geographic database)
.DLK　INMOS Transputer Development System Occam Compiler Link Info
.DLL　Dynamic Link Library
　　　CorelDraw Export/Import Filter
.DLM　Dirty Little Helper Cheat File
　　　Dynamic Link Module
　　　ASCII Delimited File (sometimes used in voting systems)
　　　3D Studio Max Character Studio
.DLS　Downloadable Sounds (Interactive Music Architecture)
　　　Norton DiskLock Setup File
　　　ADAPTA DLS/32 Supply Chain Planning (ASCII file with general number data)
　　　dataLive Database Engine File
.DLU　Dirty Little Helper Update File
.DM2　Quake 2 Demo File　[Viewer]
.DM3　Quake 3 Arena Demo File　[Viewer]
.DM_48　Quake 3 Arena Demo File　[Viewer]
.DM_57　Return to Castle Wolfenstein Demo File [Download site]
.DM_59　Return to Castle Wolfenstein Demo File [Download site]
.DM_66　Quake 3 Arena Demo File　[Viewer]
.DM_67　Quake 3 Arena Demo File　[Viewer]
.DMC　Medical Manager DML System Compiled Script
.DMD　Visual dBASE Data Module
　　　dB2K/dQuery Web DataModule
　　　OS/2 Warp Device Manager Driver
.DME　Medical Manager DML System Data Merge
.DMF　Delusion/XTracker Digital Music File
　　　Packed Amiga Disk Image
.DMG　Macintosh OS X Disk Image File (Treated like a real disk)
.DMK　Digimask File (3D human faces)
.DML　Darn! Shopping! Mall File
　　　Medical Manager DML System Script
.DMO　Derive Demo
.DMP　Dump (various)
　　　INMOS Transputer Development System Occam Core Dump
.DMS　Amiga DISKMASHER Compressed Archive (see ADF) [Amiga Forever]
.DMT　Delcam Machining Triangles (3D CAD)
.DMX　Medical Manager DML System Index for Custom .DME Files
　　　ProTrader Database
.DN8　Blue Martini UTF-8 Encoded DNA File (eCRM)
.DNA　Blue Martini DNA File (eCRM)
.DNA.XML　Blue Martini XDNA File (eCRM)
.DNC　Machine Tool Communications
.DND　ClustaW Tree File
.DNE　Darn v5+ (Windows) Events List
　　　Netica Bayes Net File
.DNG　Dungeon File (created by ID software)
.DNI　realMyst 3D Archive　[Dragon UnPACKer]
.DNL　DigitalWebBook Electronic Book (requires installation of DigitalWebBook plug-in)
　　　netMod Modem Firmware Upgrade File
.DNS　DynSite Plug-in File
.DO　 Stata Batch Analysis File
　　　DigitalOutrage Hosting Control Panel Info
.DOB　User Document Form File
.DOC　Document or Documentation (many programs/formats)
　　　MS Word Document [Buy Office XP at Shop.Microsoft]
　　　DisplayWrite 4 File
.DOCHTML　MS Word HTML Document [Buy Office XP at Shop.Microsoft]
.DOCMHTML　MS Word HTML Document [Buy Office XP at Shop.Microsoft]
.DOF　Racer 3D Geometry File
.DOG　Laughing Dog Screen Saver
.DOH　Geoworks Dependency Information File
.DOL　D-PAS Portfolio Manager Flexible Benchmarking Analysis File [Education about D-PAS]
.DOO　Atari Doodle　[XnView]
.DOP　Digital Orchestrator File
.DOQ　Digital Orthophoto Quadrangle (digital aerial photo)
.DOQQ　Digital Orthophoto Quarter Quadrangle (smaller digital aerial photo)
.DOS　Text File/DOS Specification Info
　　　1st Reader External Command File
　　　Network Driver File
.DOT　MS Word Document Template [Buy Office XP at Shop.Microsoft]
　　　Corel Lines-Definition
.DOTHTML　MS Word HTML Document Template [Buy Office XP at Shop.Microsoft]
.DOX　Text File
　　　MultiMate Document
　　　User Document Binary Form File
.DOZ　VENDINFO Description Out of Zip File
.DP　 Daily Planner Calendar File
　　　DataPhile Data File
.DPA　Serif DrawPlus Animation
.DPC　DiscPlay Collection File
　　　Delphi Package Collection File
.DPJ　DeskProto CAM Project File
.DPK　Delphi Package File
.DPL　Borland Delphi 3 Packed Library
　　　Digital Photo Librarian Database
.DPP　Serif DrawPlus Drawing
.DPR　Borland C++ (or Delphi) Default Project
.DPS　DivX XP Skin (.ZIP file format)
.DPT　Publish-It! Publication File
.DPX　Digital Moving Picture Exchange　[XnView]
.DPY　Realpolitik Saved Game
　　　PROGNOSIS Display Document File
.DQA　itaz doQument File
.DQB　D-PAS Portfolio Manager File [Education about D-PAS]
.DQD　itaz Default doQument Database
.DQY　MS Excel ODBC Query File [Buy Office XP at Shop.Microsoft]
.DR9　Directory File
.DRC　Orcad Schematic Capture Design Rules Check Report File
　　　DriveCrypt Container File (Note: This extension was changed to .DCV due to a WinXP conflict.)
　　　Borland Delphi Compiled Resource File
.DRES　Diagnosis Results
.DRJ　Deraj Data File
.DRL　DocObject Resource Locator
.DRM　Steinberg Cubase Drum File
.DRN　Darn for DOS
.DRS　WordPerfect Driver Resource
　　　Age of Empires 2 Archive　[Dragon UnPACKer]
.DRV　Device Driver
.DRW　Drawing (various)
　　　Micrografx Vector Graphic
　　　Pro/E Drawing
.DRX　Adobe Photoshop Tutorial
.DRZ　Draz Paint　[XnView]
.DS　 Chemisty Software
　　　PhotoMax Drive
　　　HP Officejet T Series All-in-One TWAIN File
.DS4　Micrografx Designer Graphics (ver 4)
.DSA　DasyTec DASYLab File
.DSB　DasyTec DASYLab File
.DSC　Oracle Discard File
　　　Nikon Coolpix Disk Identification File
　　　dpkg-source (info needed help unpack Debian source archives)
.DSCE　Diagnosis Scenario
.DSD　DataShaper Database File
　　　Document Structure Definition File
.DSES　Diagnosis Session
.DSF　Micrografx Designer
　　　PC-TRUST Document Signer (Extension means file is signed)
　　　Delusion/XTracker Digital Sample
.DSG　Doom Saved Game
.DSH　Dashboard PDA Wallpaper
.DSI　Digital Sound Module Tracker Format (unverified)
　　　R-Studio Hard Disk Scan Results File
.DSK　Borland C++ or Turbo Pascal Project Desktop File
　　　Novell Driver File
　　　Lotus Notes Design Elements
　　　SHARP MZ-series Emulator File
.DSL　Lingvo User Feature Dictionary
.DSM　Delphi Symbol File
　　　Digital Sound Module Tracker Format
　　　Dynamic Studio Music Module
.DSN　ODBC Data Source
　　　SureThing Office Labeler (formerly DesignExpress) Document
　　　Object System Designer Design
　　　Orcad Schematic Capture Schematic File
.DSP　Signature Display Parameters
　　　Dr. Halo Graphic Screen Driver
　　　MS Developer Studio Project
.DSQ　Corel QUERY File
　　　DASYLab Worksheet Sequence
.DSR　WordPerfect Driver
　　　Active Designer File
.DSRES　MS Dungeon Siege Texture File
.DSS　Digital Soup Digital Sound File
　　　DCC Active Designer File
　　　Digital Speech Standard File (Voice Recorders & IBM's ViaVoice)
.DSST　ConsumerPoint File (CACR Marketing)
.DST　PC-RDist Distribution File
　　　Embroidery Machine Stitch File　(VeePro) [possibly read with Melco Sizer Software]
.DSW　MS Developer Studio Workspace
　　　Borland C++ Desktop Settings
.DSX　Active Designer Binary File
.DSY　PC Draft Symbol Library
.DSZ　Embroidery Machine Stitch File　(VeePro)
.DT_　Macintosh Data File Fork
.DTA　Data (Various)
　　　Stata Binary Saved Datasets
　　　Hidden & Dangerous Archive　[Dragon UnPACKer]
.DTB　DesignTools PCB Design and Make (printed circuit design - common in UK schools)
.DTD　SGML Document Definition File
　　　DesignTools 2D Design (vector drawing - common in UK schools)
.DTEA　Diagnosis Template Archive
.DTF　Q&A Database
　　　MS Exchange Header File (Used when sending to Lotus Notes)
.DTL　Hal/Supernova/Lunar/LunarPlus Screen Readers/Magnifiers
.DTM　DigiTrekker Module
　　　Softshare Delta Translation Map
.DTP　SecurDesk! Desktop
　　　Timeworks Publisher Text Document
　　　Publish-It! Publication
　　　Pressworks Template File
.DTQ　Database Tools Query
.DTS　Digital Surround Audio File Format
　　　MS Data Transformation Services (Data Transformation Packages used by MS SQL Server)
.DTX　LaTeX Source and Documentation Archive
　　　E-Book File
　　　DocuTech Print6 Engine File (Prints DocuTech Closing Documents)
　　　LithTech Model Texture File
.DUN　Dial-Up Network
.DUP　Duplicate Backup
.DUS　Readiris Font Dictionary
.DV　 DESQview Script
　　　Digital Video File
.DVB　Visual Basic for Applications Macro Project
.DVC　Lotus File
.DVF　DV Studio Camcorder Graphics File
.DVI　TeX Device Independent Document
.DVP　DESQview Program Information
　　　AutoCAD Device Parameter
.DVR　Device Driver
.DW2　DesignCAD Drawing File
.DWC　Compressed Archive
.DWD　DiamondWare Digitized File
.DWF　Autodesk WHIP! Drawing Web File
　　　MS WHIP autoCAD REader Drawing Web File
.DWG　AutoCAD Drawing Database
　　　Drafix Drawing
.DWI　Dance With Intensity (dance simulator)
.DWK　Locked DWG File
.DWN　Cisco Download File (usually a system update)
　　　Firmware Update File (several)
　　　Experimental File Format (.DAWN)
.DWP　Dweep Game Levels
　　　DeScribe Document File
.DWS　Dyadic Workspace File
　　　AutoCAD Standartization File
.DWT　AutoCAD Template/Prototype File
　　　Macromedia Dreamweaver Template File
　　　Demon's World Game Texture File
.DWY　Dwyco Video Clip
.DX　 Document Imaging File
　　　Digital Electric Corporation (DEC) Data Exchange File
　　　Deus Ex File
.DXB　Drawing Interchange Binary
.DXF　AutoCAD Drawing Interchange Format
.DXL　Dapyx MP3 Explorer (MP3 database organizer)
　　　DOORS Extension Language
.DXMAX　Oozic File
.DXN　Fujitsu dexNet Fax Document
.DXPACK　DesktopX Object　(customizes the Windows Desktop)
.DXR　Vegas Jackpot Gold Game File
.DXTHEME　DesktopX Theme File (customizes the Windows Desktop)
.DXR　Macromedia Director Protected Movie File
　　　Dependable Strengths Administrator Resources (Macintosh)
　　　Green Building Advisor File
.DYN　Lotus File
.DZ　 Dzip Compressed File
.E　　Specman Testbench E-program Source File
.E00　ArcInfo Coverage Export File (GIS-related text file)
.E01　Encase Forensic Software
.E2　 thinkdesign CAD Design
.E3　 thinkdesign CAD Design
.E48　Emu48 HP48 Emulator File
.E78　IBM 3270 Terminal Emulator Screen Layout Definition
.EAC　EmEditor Auto Completion File
.EAF　Aframe File (suite of generic testing and assessment software)
　　　MicroEmacs Abbreviation File Format
　　　FRAGSTATS*ARC File (Landscape Structure/Spatial Pattern Analysis for ARC/INFO)
.EAL　Enfocus Action List
.EAR　Java Enterprise Application Packaging Unit
.EAS　Elite Visual Basic API Spy (Use care entering this site)
.EAZ　Express Assist File
.EBF　Pocket PC WindowsCE Form File
　　　EARS Definition Backup (EARS = UK Liberal Democrats Election Agents Record System)
.EBJ　Geoworks Error Checking Object File
.EBK　EARS Database Backup (EARS = UK Liberal Democrats Election Agents Record System)
.EBO　Microsoft Reader Ebook Format
.EBP　Pocket PC WindowsCE Project File
.EBS　WindowsXP Scanner File
.EBX　Electronic Book Exchange (Open Source) [Adobe reader]
.ECA　electroCAD File
.ECC　Ecchi Role-playing Format (Generally X-rated Anime File)　[XnView]
.ECF　WinFax Office Add-in File
　　　MS Outlook Add-in File
.ECO　NetManage ECCO File [Alternate site]
.ECR　Ecrypt E-mail File
.ECS　Encrypted Compressed GIS Software Geographic Shape File　[GIS info]
　　　(ArcView, et.al.) (JShape/FShape)
.ECW　Ensoniq Waveset Format
　　　EclipseCrossword Crossword Puzzle
　　　Enhanced Compressed Wavelet　[XnView]
.ECW2002PUZZLE　EclipseCrossword Puzzle
.ECW2002WORDS　EclipseCrossword Word List
.ED　 EasyDraw CAD File (Japanese CAD program)
.ED5　EDMICS Graphics File
.ED6　EDMICS Graphics File
.EDA　Ensoniq ASR Disk Image
.EDB　ROOTS3 Geneological Data
.EDC　Kryptel (light) Decoder/Encoder
.EDD　FrameMaker Element Definition Document
.EDE　Ensoniq EPS Disk Image
.EDF　Workshare Synergy Document Change Management
.EDK　Ensoniq KT Disk Image
.EDL　Edit Decision List (management for video and film post production)
.EDM　CAD Contouring Parameter Data File
　　　Extinction Corrected Differential Photometry
.EDML　Dreamweaver MX Extension File
.EDN　EDIF Netlist File (Xilinx ISE FPGA Compiler)
.EDP　Attachmate Extra! Session
.EDQ　Ensoniq SQ1/SQ2/KS32 Disk Image
.EDS　Ensoniq SQ80 Disk Image
.EDT　VAX Edt Default Settings
.EDV　Ensoniq VFX-SD Disk Image
.EEB　WordPerfect Equation Editor Button Bar
　　　EaseBook File (Word add-on for writing books and articles in XML)
.EES　Empire Earth Scenario File [SCN Punk Site]
.EFA　Ensoniq ASR File
.EFC　EFCoins File
.EFD　EARS Filter Definition (EARS = UK Liberal Democrats Election Agents Record System)
.EFDEMO　Star Trek Voyager Elite Force Demo File　[Viewer]
.EFE　Ensoniq EPS File
.EFF　IEEP TeamBG File (modify Infinity Engine games)
　　　EverQuest Effects File
.EFK　Ensoniq KT File
.EFQ　Ensoniq SQ1/SQ2/KS32 File
.EFS　Ensoniq SQ80 File
.EFT　Chiwriter High Res Screen Characters
.EFV　Ensoniq VFX-SD File
.EFX　eFax.com Fax Document (Used to be JetFax in 1999)
.EGA　Ventura EGA Screen Characters
.EGD　GIS Software Encrypted Grid Shape File　[GIS info]
　　　(ArcView, et.al.) (JShape/FShape)
.EGS　GIS Software Encrypted Grid Shape File　[GIS info]
　　　(ArcView, et.al.) (JShape/FShape)
.EHTML　Enhanced HTML
.EI　 Electric Image　[XnView]
　　　EARS Component File (EARS = UK Liberal Democrats Election Agents Record System) [Filename starts with E]
.EID　Faena MyID Encrypted File
　　　IBM ViaVoice Vocabulary File
.EIDI　Electric Image　[XnView]
.EK5　Simrad EK500 Scientific Echosounder Data [Use Echoview to analyze]
.EK6　Simrad EK60 Scientific Echosounder Data [Use Echoview to analyze]
.EKM　EXP: The Scientific Word Processor Macro
.EL　 eMacs Lisp Source Code
.ELC　eMacs Lisp Byte-compiled Source Code
.ELD　EARS Label Definition (EARS = UK Liberal Democrats Election Agents Record System)
.ELETTERHEAD　Electronic Letterhead
.ELF　Black Belt Systems Extended Layer File
　　　Tasklink for Windows Machine Control Executable and Linking Format
.ELG　EARS Log (EARS = UK Liberal Democrats Election Agents Record System)
.ELI　Encyclopedia Article List
.ELL　ATI Radeon Video Driver File
.ELM　MS FrontPage Theme-Pack File [Buy Office XP at Shop.Microsoft]
.ELOG　McAffee Firewall Log
.ELT　Event List Text
.EM1　Emax I Bank File
.EM2　Emax II Bank File
.EMAIL　Outlook Express Mail Message [Buy Office XP at Shop.Microsoft]
　　　　(Rename to .EML to access in OE but beware of viruses and worms)
.EMB　Everest Embedded Bank File
　　　IEMBL Nucleotide Format (MIME type chemical/x-embl-dl-nucleotide)
.EMBL　IEMBL Nucleotide Format (MIME type chemical/x-embl-dl-nucleotide)
.EMD　ABT Extended Module
.EMF　Extended Windows Metafile Format　[IrfanView]
.EML　MS Outlook Express Electronic Mail [Buy Office XP at Shop.Microsoft]
　　　　Note: .EML files with "funny" names in multiple folders implies the Nimda worm.
.EMM　EARS Mail Merge Definition (EARS = UK Liberal Democrats Election Agents Record System)
.EMR　Emrite (Wordprocessor file)
.EMS　PC Tools Enhanced Menu System Config
　　　YoshimuraEMS Motorcycle Fuel Injection
.EMU　Emulation
.EMX　Enigmacross Puzzle File (Develop professional acrostic puzzles)
　　　Emax System File
.EMY　Eericsson Ringtone
.EMZ　Windows Compressed Enhanced Metafile (MS graphic format for Office and Visio)
.ENC　UUENCODE Encoded File
　　　Video File
　　　BlackIce Evidence Log File
　　　Knowledgeware Encyclopedia
　　　Encore Music File
　　　Dungeon Related File (created by ID software - tied to .DNG file)
.END　Corel Arrow Definition
.ENF　RightClick-Encrypt File
　　　EndNote Filter File
.ENG　Dictionary
　　　Sprint Dictionary Engine File
　　　EnerGrahics Chart Graphics File
.ENL　Endnote Library File (for research papers)
.ENR　Enroute Toolath
.ENS　EndNote Styles File
.ENT　Entrust Entelligence Secured File
.ENU　ATI Radeon Video Driver File
.ENV　WordPerfect Environment
　　　WOPR Enveloper Macro
　　　Acrobat Spelling File
　　　Sierra Print Artist Envelope
　　　The Golem Project Environment File
.ENW　Sierra LandDesigner 3D Terrain Modeling
.ENZ　EndNote Connection File
.EOT　MS WEFT Embedded OpenType File
.EP　 Bonas Jaquard EP Weave Format File
.EP2　EclipsePackager Package
.EPA　Award BIOS Logo　[XnView]
.EPD　Express Publisher Publication File
　　　EARS Printer Definition (EARS = UK Liberal Democrats Election Agents Record System)
.EPI　Express Publisher Document File
　　　EclipsePackager Invoice
　　　EPS Interchange Format　[XnView]
.EPL　Tallyman E-commerce Software?
.EPP　EditPad Pro Project
.EPR　Eiffel Project Repository
.EPS　Encapsulated PostScript　[XnView] [IrfanView]
　　　Ventura Printer Font
.EQL　DART Pro 98 Fabric Equalization Presets
.EQN　WordPerfect Equation
.ER1　ERWin File
.ERD　Entity Relationship Diagram
.ERI　Entis Rasterized Image (ERI-chan)　[XnView]
.ERM　Entity Relationship Diagram Model
.ERP　British Economics & Social Research Council Electronic Form
.ERR　Error Log (various - many associated with install programs)
.ERS　EARS Control File (EARS = UK Liberal Democrats Election Agents Record System)
.ERX　ERWin File
.ES　 EasySIGN Drawing Sheet
.ESF　Emblaze Audio File
.ESH　Extended Shell Batch File
.ESI　Esri Plot File
.ESL　MS Visual FoxPro Distributable Support Library
.ESM　Enhanced Simplex　[XnView]
.ESP　Ventura File
　　　ACD/CurveManager Analysis File
　　　Ethos System Analysis File
　　　ACD Analysis File (Advanced Chemistry Development)
　　　E$Planner File
.ESR　4D Database Windows Procedure
.ESS　EXP: The Scientific Word Processor Style Sheet
.EST　MS Streets & Trips 2001 Trip File
.ESY　EmEditor Syntax File
.ET2　Electronic Tax Return Security File (Australian taxes)
.ETA　eTreppid Audio File (eTplayer & ETVC media CODEC)
.ETB　Seismograph File (compressed?)
.ETC　eTreppid Compressed File
　　　Seismograph File
.ETH　Ethnograph Document File
.ETM　eTreppid Audio File (eTplayer & ETVC media CODEC)
.ETV　eTreppid Audio File (eTplayer & ETVC media CODEC)
.ETX　SetText Structure Enhanced Text
.EUC　Japanese (Kanji)
.EUI　Ensoniq EPS Family Compacted Disk Image
.EUK　Euklides Dynamic Geometry
.EUM　Euklides Dynamic Geometry
.EUS　EDonkey2000 Serverlist Tool
.EV　 EchoView File (sonar fishing data)
　　　EV8 File (Virtual Reality applications)
.EV2　Java File
.EV3　EVERLOCK Options File
.EV6　EV8 File (Virtual Reality applications)
.EVA　Viz Modeler 3D Scene Archive (used for TV graphics)
.EVB　Embedded Visual Basic File (used on Pocket PCs) [Developer info]
.EVC　EchoView Color Scheme (Echocolor-created data)
.EVI　EchoView Index File (speed up processing of echosounder data)
.EVK　EVERLOCK File
.EVL　EchoView Line File (echosounder time/depth coordinates)
.EVR　EchoView Region File (echosounder time/depth coordinates)
.EVT　PC Tools Event File Scheduler
　　　MS WinNT/2000 Event Viewer Log File
.EVY　Envoy Document
.EWB　Electronics Workbench
.EWD　Express Publisher for Windows Document
.EWL　MS Encarta Document
　　　EclipseCrossword Word List
.EWP　QuickCog Project File
.EWS　QuickCog Sample Set File
.EX　 EPM Macro File (software install)
　　　Euphoria File (Programming language)
.EX2　PC Doctor File (HP computer - unverified)
.EX3　Harvard Device Driver (Harvard Graphics taken over by Serif)
.EX^　Norton Live Update File
.EX_　Compressed .EXE File in an Install Archive
.EXC　QEMM Exclude File
　　　REXX Program
　　　MS Word Exclusion Dictionary [Buy Office XP at Shop.Microsoft]
　　　Text Document
.EXD　Control Information Cache
.EXE　Executable File
　　　Out-of-process Code Component Used by COM Clients (Component Object Model)
　　　Settlers IV Saved Game
.EXF　Fuji EXIF Format File (Any JPEG viewer should view) [File Format (PDF)]
.EXM　HP Calculator Executable
.EXP　ICQ Saved Chat File
　　　Embroidery Design File [possibly read with Melco Sizer Software]
.EXT　Norton Commander Extension File
　　　WS-FTP ASCII Binary Transfer File
　　　E-mail Text Attachment (unverified)
　　　Extinction Corrected Photometry
.EXU　Euphoria File (Programming language)
.EXW　Euphoria File (Programming language)
.EXX　IBM LinkWay MsgPut Intermediate File
.EYB　Encyclopedia Yearbook File
.EYE　Glass Eye File (stained glass window design)
.EZC　EZScreen Screen Saver Editor
.EXF　Calculus EZ-Fax Fax
.EZM　Text File (From some mailing lists)
.EZP　Edify Electronic Workforce Backup Utility
.EZS　Sunburst Technology Easy Sheet Document
.EZT　Sunburst Technology Easy Sheet Template
.EZX　WHAP File
　　　Computer Generated Forces for Action Fog Defaults
.FOL　1st Reader Saved Message Folder
.FOLDER　Mail Folder
.FON　Font File
　　　Telix Dialing Directory
　　　Procomm Plus Call Log
.FOO　Kai's SuperGoo Fusion
.FOR　FORTRAN Source　[FORTRAN]
　　　WindowBase Form
.FOT　Installed TrueType Font
.FOUR　VAX CRYSTALS Chemical Crystallogaphy File
.FOW　Family Origins File (Genealogy)
.FOX　FoxBase File
.FP　 FileMaker Pro File
　　　FoxPro Configuration Info
.FP1　Flying Pigs for Windows Data
.FP3　FileMaker Pro File
　　　Imsi FloorPlan 3D
.FP5　FileMaker Database Design Report Template
.FPA　Franklin Potter Associates Business Invoice Designer
.FPC　FoxPro Catalog File
.FPF　Canadian Flight Wizard (flight planning software)
.FPG　DIV Game Studio Multi Map　[XnView]
.FPK　JetForm FormFlow File (JetForm now Accelio)
.FPS　Operation Flashpoint Game File
.FPT　FileMaker Pro File
　　　FoxPro Memo Fields
.FPW　FloorPlan Plus Floorplan Drawing
.FPX　FlashPix Bitmap　[IrfanView]
.FQF　FlashFXP Queue File
.FR3　dBase IV Renamed dBaseIII+ Form
.FRA　FrameViewer File
.FRE　Creative Digital Blaster Digital VCR File
　　　Male Normal CT　[XnView]
.FRF　FontMonger Font
.FRG　dBase IV Uncompiled Report
.FRL　FormFlow File
.FRM　Form File
　　　FrameMaker Document
　　　FrameBuilder Document
　　　Oracle Executable Form
　　　Visual Basic Form
　　　dBASE IV Report File (and others)
　　　WordPerfect Merge Form
　　　DataCAD Symbol Report File
　　　Megalux Frame　[XnView]
　　　MYOB Form File
.FRO　dBase IV Compiled Report
　　　FormFlow File
.FRP　PerForm Pro Plus Form
　　　FaxRush Packages (listing of fax files - now .ZPK)
.FRS　WordPerfect Graphics Driver
.FRT　FoxPro Report File
.FRX　Visual Basic Binary Form File
　　　FoxPro Report File
.FRZ　FormFlow File
.FS　 NetBSD File (usually BOOT.FS)
　　　PDT Feature Structure File
　　　FormSaver File
　　　FlexiSIGN File
.FSC　Campaign Cartographer 2 File
.FSF　Convert It! Factor File
　　　fPrint Audit Tool File
.FSH　EA Sports Game Graphic Editor File
.FSI　FileSplit
.FSL　Borland's Paradox 7 Forms
　　　Corel Paradox Saved Form
.FSM　Farandoyle Sample Format
.FSR　File Substring Replacement Utility
.FSS　Iomega Backup File Selection Set
.FST　FastStats Analyzer File
　　　dbFast Linkable Program
.FSX　Lotus 1-2-3 Data
　　　FormSaver Fields
.FSY　PhotoFantasy Image　[XnView]
.FT　 Lotus Notes Full Text Index
.FTB　Roots3 Index File
.FTG　Windows Help Full-text Search Group File
.FTM　Family File
　　　MicroGrafx Font
.FTP　FTP Configuration Information
.FTS　Windows Help Full-Text Search Index File
　　　Flexible Image Transport System　[XnView]
.FTV　Forest & Trees File
.FTW　Family File
　　　FontTwister File (text effect generator)
.FU　 F* You Software Key Generator (Software protection breaker)
.FUL　Full Foram Count File
.FUN　Koolmoves File (Flash tool)
.FUZZY　Fuzzy Logic File
.FVF　Fluke View
.FVML　formVista (web application development environment) - Product in alpha Jul 2002
.FVS　Forest Vegetation Simulator Tree Data File
.FVT　Interlock Public Computer Utility
.FW　 Framework Database
.FW2　Framework II File
.FW3　Framework III File
.FW4　Framework IV File
.FWB　FileWrangler Data File Backup
.FWL　FileWrangler EXE Library
.FWS　FileWrangler Data File for File Splitting Configuration
.FX　 FastLynx On-Line Guide
.FXD　WinFax Sent Document (TIFF format)
　　　FAXit Phonebook
.FXI　File-Ex File
.FXM　WinFax & WinFax MiniViewer Fax
　　　BigFix
.FXO　Fax Image Document　[Open with Quick view Plus]
.FXP　FoxPro Compiled Source
.FXR　WinFax Received Document (TIFF format)
.FXS　WinFax Fax Transmit Graphic
.FXT　Finale Music Notation Software Plug-in
.FZB　Casio FZ-1 Bank Dump
.FZF　Casio FZ-1 Full Dump
　　　FontZip Font Packer
.FZV　Casio FZ-1 Voice Dump
.G　　Applause Data Chart
　　　Cliq Accessories Datebook Schedule Group [Linux Suite PDF Description]
.G3　 G3 FAX File　[XnView] [IrfanView]
.G32　GFA BASIC 32 Program File
　　　PaperPort File
.G3D　GenDesigner 3.x Genealogy Database
.G3F　Zetafax TIFF File (fine resolution)
.G3N　Zetafax TIFF File (normal resolution)　[XnView]
.G4　 GTX RasterCAD File
　　　Access [XnView]
.G42　ADAPTA DLS/32 Supply Chain Planning (ASCII file with info about SKUs and product-groups)
.G53　ADAPTA DLS/32 Supply Chain Planning (ASCII file with info about Bills of Material)
.G8　 PicLab Plane Three Graphics
.GAC　Global Audio Control Skin
.GAF　Total Annihilation　[XnView]
.GAL　Gallery of Pictures
　　　Corel Multimedia Manager Album
.GAM　GammaFax Fax Document
　　　TADS 2.x Game File
　　　Baldur's Gate Game File
　　　Animated E-mail (unverified)
.GAP　Electrical Generation Analysis and Planification
.GAT　Gator File (password manager)
.GAU　Gaussian Input File (MIME type chemical/x-gaussian-input)
　　　MS Flight Simulator Gauge　(e.g., altimiter.gau)
.GAY　Reported as Sometimes a Porn File (presumably a renamed standard graphic file)
.GB　 Chinese
　　　Nintendo GameBoy Emulator ROM Image File
　　　Printfox/Pagefox　[XnView]
.GBA　Nintendo® Game Boy Advance ROM Image
　　　GrabIt Batch Files
.GBC　Nintendo® GameBoy Color Emulator ROM Image File
.GBD　Gator Banner File
.GBK　Interbase Database Backup
.GBL　VAXTPU Global Definitions (VAXTPU is default OpenVMS editor)
.GBR　GIMP Brush File　[GIMP]　[XnView]
　　　Gerber Format File (Graphics Language for the Electronics Industry) [Viewer]
.GBS　Gameshark Online Save/Snapshot
.GBT　Photoshop File
.GC　 Sierra Print Artist Greeting Card
.GC1　Golden Common Lisp Source Code
.GC3　Golden Common Lisp Source Code
.GCA　GOCA Graphics File
　　　G Compression Archiver Compressed File (link is Japanese site) [Mime Type application/x-gca-compressed]
.GCC　VISUAL EPR COSEUL.EXE Result (table of components of Cartesian tensors)
.GCD　Generic CADD Drawing
　　　IsoBuster File
　　　Prassi CD Image
　　　GNUe Class Definition
.GCF　WinXComp Grouped Compressed File
.GCI　GTA2 Game File
　　　VISUAL EPR COSEUL.EXE Result (table of components of irreducible tensors)
.GCM　GeoConcept Map File
　　　Group Mail CMessage Store File
.GCP　Ground Control Point File (map projection)
.GCR　VISUAL EPR COSEUL.EXE Output
.GCT　ApplinX Screen Scrapper (unverified)
.GDB　Interbase Database
　　　Group Mail File
.GDF　GEOS Dictionary
.GDM　Bells, Whistles, and Sound Boards Module
.GDR　SymbianOS Bitmap Font File　(can contain multiple typefaces)
.GDS　Image File
　　　Chip Layout Information
.GED　GEDCOM Family History File
　　　EnerGraphics File
　　　Graphic Environment Document
　　　Arts & Letters Graphics File
.GEM　GEM (a desktop interface) File
　　　Digital Research GEM Paint　[XnView]
　　　Ventura Publisher Vector Graphics
.GEN　Ventura-Generated Text File
　　　Chromeleon Generic Driver Configuration
　　　dBase Application Generator Compiled Template
.GEO　VideoScope File
　　　GeoSoft Compressed Add-on
　　　Geoworks Geode
　　　GeoPaint　[XnView]
　　　Trumpf ToPs File (CAD/CAM, laser cutting)
.GER　GerberView File (partial support for extended Gerber [RS-274X] file format)
.GF　 gFx UNIX Plotting Program
　　　METAFONT Generic Font File
　　　Geometric Data
　　　Pilot Logbook for Grok File
　　　Starfleet Command - Empires At War File
.GFA　Bitmap Graphics File (see .GFX/Warcraft; files are similar)
.GFB　GIFBlast Compressed GIF Image
.GFC　Patton & Patton Flowcharting 4 File
.GFD　Menus for GNUe Forms
　　　VISUAL EPR Energy, Fields File
.GFI　Genigraphics Graphics Link Presentation
.GFT　NeoPaint Font
.GFX　Genigraphics Graphics Link Presentation
　　　WarCraft II Image File
.GFY　Grafical 1.0 File
.GG　 Sigmac Compiled Machine Code
　　　Gridgen File
　　　Sega GameGear Game ROM Image
　　　Koala Paint Compressed File　[XnView]
.GG1　Goofy Golf Deluxe Course
.GG2　Goofy Golf Deluxe Saved Game
.GGI　GGI Extension
.GGP　GemCom Graphic Format
.GHO　Symantec Ghost Disk Image File
.GHS　Lasertank High Scores
.GI　 Sony CD Extreme Global Image File
.GIB　Graph-in-the-Box Chart
.GID　Windows Help Index File
.GIF　Graphic Interchange Format　[XnView] [IrfanView]
.GIFF　Graphic Interchange Format　[XnView] [IrfanView]
.GIG　Sound File
.GIM　Genigraphics Graphics Link Presentation
.GIW　Graph-in-the-Box Presentation
.GIX　Genigraphics Graphics Link Presentation
.GJD　7th Guest Game Archive
　　　11th Hour Game Archive　[Dragon UnPACKer]
　　　GetJet Professional Database (really an Access database)
.GJF　Gaussian Input Data File
.GKH　Ensoniq EPS Family Disk Image
.GKS　Gravis GripKey Document
.GL　 GRASP - Graphical System for Presentation File
.GLD　Glide File
.GLM　Glim Data File
.GLY　MS Word Glossary [Buy Office XP at Shop.Microsoft]
.GM　 Autologic　[XnView]
.GM2　Autologic　[XnView]
.GM4　Autologic　[XnView]
.GM?　Heroes of Might & Magic III Saved Game (? = number of human players in game)
.GMAX　gmax Game Creator
.GMD　Game Maker Stored Game (game under development--also see .GMR)
.GME　Interact DexDrive Playstation Memory Card Save
.GMF　Applause CGM Graphics
.GMM　Group Mail Message Log File
.GMP　GTA2 Game File
　　　Group Mail List Information File
　　　Geomorph Tile Map
.GMR　Schlafhorst Automation Graphical Monitor Record
　　　Game Maker Compiled Game (finished game--also see .GMD)
.GMS　Corel Global Macro File
.GMT　Scarlett Expert System Compiler Grammar File (Scarlett is not presently available)
.GMX　Group Mail Message File
.GNA　Genigraphics Graphics Link Presentation
.GNO　Genopro Genealogy Document File
.GNT　Micro Focus Generated Code
.GNX　Genigraphics Graphics Link Presentation
.GOB　Dark Forces Game File　[Dragon UnPACKer]
　　　Indiana Jones 3D Archive　[Dragon UnPACKer]
.GOC　Geoworks Goc Source Code
.GOH　Geoworks Goc Header
.GOO　Kai's Power Goo / Kai's Supergoo
.GOR　Gorilla (Film & Video Production Management)
.GP　 Geoworks Glue Geode Parameter File
.GP3　CCITT Group 3 File (fax)
　　　GuitarPro 3
.GP4　CCITT Group 4 File (fax)
.GPD　VISUAL EPR Input Data for PARAMS.EXE
.GPF　Believed to be a Japanese graphic file
.GPG　GnuPG Encrypted File (usually compatible with .PGP files)
.GPH　Lotus 1-2-3 Graph
　　　Stata Graph
.GPK　Omnigo Program Package　[Added Info]
.GPL　GPS Log File (used by mapping software)
.GPP　GraphPap Graph Paper File
　　　Serif GraphicsPlus Object
.GPR　VISUAL EPR PARAMS.EXE Results
.GPS　Pocket CoPilot GPS Tracks Data File
.GPX　BASIS File
.GQA　BI/Query Data Model Admin Layer
.GQL　BI/Query Data Model (used to be Andyne GQL)
.GQU　BI/Query Data Model User Layer
.GR　 XGMML (eXtensible Graph Markup and Modeling Language) File
.GR2　Windows 3.0 Screen Driver
.GR3　Windows 3.0 Screen Grabber
.GRA　Flight Simulator File
　　　MS Graph Chart
　　　SigmaPlot Data File
　　　STN Express Transcript Graphics File　(search science databases through STN?
.GRAAL　Offical Graal Level
.GRB　MS-DOS Shell Monitor
.GRD　Gradebook Power File
　　　Map Projection Grid File
.GREY　Picture File (raw GREY graphics) RAW RGB 24-bit Graphic　[XnView]
.GRF　Graph
　　　Graph Plus Graph File
　　　Golden Software Graph File
　　　Grafix Idea File
　　　Graph Edit File [Part of DirectX SDK]
　　　DLG "Graphic" Format
.GRL　Matlab Graphic Format
.GRM　VISUAL EPR Input Data for FIntGraf
.GRN　Granny 3D Rendering Program
.GRO　Serious Sam Game File　[Dragon UnPACKer]
　　　Warlords Battlecry Archive　[Dragon UnPACKer]
　　　HP-48/49 GROB　[XnView]
.GRB　HP-48/49 GROB　[XnView]
.GRP　Windows Program Manager Group
　　　PixBase Pictures Group
　　　Duke Nukem 3D Archive　[Dragon UnPACKer]
　　　Shadow Warrior Archive　[Dragon UnPACKer]
.GRQ　Quickstep Barco Graphics
.GRS　Packedge Barco Graphics
.GRT　VISUAL EPR Calculation Results of Fields
.GRV　Groove Networks File
.GRX　GetRight File List
.GRY　Picture File (raw GREY graphics) RAW RGB 24-bit Graphic　[XnView]
.GS1　GraphShow Presentation
.GSC　GeneStudio File (Molecular Biology Software)
.GSD　Professional Draw Vector Graphics
.GSM　Raw GSM 6.10 Audio Stream (Global System for Mobile Audio)
　　　Sound File [Linux Player]
　　　US Robotics Modem File
.GSP　Geometer's Sketchpad Material File
.GSW　GraphShow Worksheet
.GT2　Graoumftracker Music Module (new)
.GTK　Graoumftracker Music Module (old)
.GTP　GuitarPro File
　　　MultiFS Video File
.GTS　Genome Software Tempo Alarm Clock
.GTY　Gibson Tray File
.GUP　PopMail Data
.GUR　Gutsch & Exner Software Update Undo
.GUX　Gutsch & Exner Software Update
.GV　 Grandview (DOS-based outline program by John Friend who licensed to Living Videotext; bought by Symantec)
.GWI　Groupwise File (binary file that contains link information)
.GWP　Greetings WorkShop File　[Now MS Picture It!]
.GWS　GeoMedia Geoworkspace File
.GWX　Genigraphics Graphics Link Presentation
.GWZ　Genigraphics Graphics Link Presentation
.GX1　Show Partner Graphics File
.GX2　Show Partner Graphics File
.GXC　General CADD Pro File
.GXD　General CADD Pro File
　　　GX-Reports File
　　　Jeol EX Spectrometer Data File
.GXF　General CADD Pro File
.GXL　Genus Graphics Library
.GXM　General CADD Pro File
.GXP　Jeol EX Spectrometer Data File
.GXR　Genexus Report Viewer
　　　GX-Reports File
.GXT　GTA2 Game File
.GYM　Sega Genesis Music Logged Format
.GZ　 Gzip Compressed Archive
.GZIP　Gzip Compressed Archive (more usually seen as .GZ)
.HVD　chosenOS HoverNews Skin File
　　　ISIS Hviews File (chemical reaction database)
　　　CMT Surveyor's Assistant 1.x/2.0x Job
　　　HerdView Event Data File
.HWCFG　VersaPro Hardware Configuration File
.HWD　Hollywood Presentation File
.HWL　Hangman Deluxe Word List
.HWP　Hangul (Korean) Word Processor File
.HX　 EARS Component File (EARS = UK Liberal Democrats Election Agents Record System) [Filename starts with E]
.HXM　Procomm Plus Alternate Protocol Selection Menu
　　　Descent2 HAM File
.HXS　Help 2 File (replacement for .CHM)
.HXX　C++ Header
.HY1　Ventura Publisher Hyphenation Algorythm
.HY2　Ventura Publisher Hyphenation Algorythm
.HYC　WordPerfect Hyphenation File
.HYD　WordPerfect Hyphenation Dictionary
.HYP　Hypertext File
　　　Hyphenation File
　　　Acrobat Spelling File
　　　Compressed Archive
.HZ　 Chinese
.JSH　Henter-Joyce, Inc. Jaws Script Header File (Screen reader program)
.JSL　PaintShop Pro File
.JSM　Henter-Joyce, Inc. Jaws Script Message File (Screen reader program)
.JSP　Java Server Page
.JSS　Henter-Joyce, Inc. Jaws Script Source File (Screen reader program)
.JT　 JT Fax
.JTD　Ichitaro 11 (major Japanese word proccesser)
.JTF　JPEG Tagged Interchange Format Image
　　　Hayes JT Fax　[XnView]
.JTK　Sun Java ToolKit File
.JTP　JetForm File
.JVC　Digital Camera File
.JW　 Justwrite Text
　　　Jigsaw Terminal File (Real-time financial data display)
.JWL　Justwrite Text File Library
　　　Easy CD Creator's CD Label
.JWP　JWP Document (Japanese word processor)
　　　Easy CD Creator Label File
.JZZ　Jazz Spreadsheet
.K　　Desktop Color Separation Specification Black Layer (usually an EPS file)
.K2　 Kar2ouche Storyboard File
.K25　Kurzweil 2500 Sample
　　　Kodak DC25 Digital Camera File　[XnView]
.KAP　MapInfo Sea Chart
.KAR　Karaoke MIDI File
.KAU　KeyAudit Software Audit
.KB　 Borland C++ Keyboard Script
　　　Knowledge Pro Source Code
.KBD　Keyboard Script File Layout (various)
　　　　(Programs produce these layout files but the operating system actually uses them.)
.KBI　Keirsey-Bates Temperament Sorter Index
.KBM　Reflection Keyboard Script File Layout
　　　Scala Keyboard Mapping (Musical scale editor)
.KBP　Keirsey-Bates Temperament Sorter Profile
.KBR　Keirsey-Bates Temperament Sorter Data
.KCL　Kyoto Common LISP Source Code
.KCP　Keychamp File
.KDC　Kodak Photo-Enhancer/Photogen File (raw bitmap image)　[XnView] [IrfanView]
.KDF　Kinkos Photo
.KED　KEDIT Profile and Macro File (DOS-based version of IBM XEDIT)
.KEX　KEDIT Macro File
.KEY　Keyboard Macros
　　　Forecast Pro Datafile
　　　Program Security or Registration File (various)
　　　Sentry 2020 Encryption File
　　　Top Secret Crypto File
　　　DataCAD Icon Toolbar File
　　　Diablo II Key File
.KF2　Max Payne Model File
.KFA　Dark Age of Camelot Animation
.KFS　Max Payne Model File
.KFX　KoFax Group 4 Image　[XnView]
.KGB　Kremlin Encrypt File
.KIC　Kodak Image Compression File　[TIFF Info]
.KIF　Autodesk AutoCAD Key Index File
.KIT　Raven Toolkit File
.KIX　KixTart Script (Win NT login scripts)
.KIZ　Kodak Digital Postcard File
.KJV　TheWord & Bible Companion King James Version Bible
.KKW　RoboHELP Keyword Help project Index File
.KML　Emu48 Emulator File
.KMN　SIL Hebrew Font System Keyboard
.KMP　Korg Trinity KeyMaP File
.KNF　Universal Flat Knitting Machine Pattern Design
.KNO　Personal Knowbase File
.KOA　Koala Paint　[XnView]
.KOS　MicroType Pro Document
.KPF　Kapere (download manager, website grabber and more)
.KPG　Kai'S Power Goo Graphic
.KPP　SmartPad Toolpad
.KPS　IBM KIPS Bitmap　[XnView]
.KQP　Konica Quality Picture (Konica Photo Imaging on-line photo service)　[XnView]
.KR1　Kurzweil 2000 Sample (multi-floppy)
.KRX　Karaoke MIDI File
.KRY　Herolab Krypten
.KRZ　Kurzweil 2000 Sample
.KS　 SOF Game File Log
.KSC　Korg Trinity Script
.KSE　Keepsake Studio Export File
.KSF　Korg Trinity Sample
.KSH　Prodigy Internet Registration File
.KST　Olivetti Olitext Plus Script File
.KTK　Kutoka's Mia (children's education)
.KTT　KeyText Data File
.KUMAC　Physics Analysis Workstation Macro File
.KVB　Klick-N-View Business Cards [Download] (Note: Developer site - http://www.knvs.com/ - did not exist when checked)
.KWD　KWord File (Linux Word Processor)
.KYB　Keyboard Layout
.KYE　Kye Game Data
.KYF　Visual-Voice Mouth Movement File
.??_　Files ending in "_" are often compressed install files of the same
　　　　name (e.g., .EX_ expands to .EXE, .DL_ expands to .DLL, etc.)
.L　　LEX Program File
　　　Link Instructions
　　　LISP Program File
　　　Cliq Accessories Datebook Lock File [Linux Suite PDF Description]
.LA　 Lightscape Animation
.LAB　Mailing Labels
　　　NCSS Data File
.LAD　Daylon Leveller Animation Data
.LAN　ERDAS IMAGINE LAN Sensor Data
.LAR　Liquid Audio Player Registration File
.LAT　Crossword Express Lattice File
.LAV　Liquid Audio Player Voucher File
.LAVS　Liquid Audio Player Streaming Voucher File
.LAY　Applause Word Chart Layout
　　　Lightscape Layer State
　　　Track Builder Simulation Compiler Code (Railroad centralized traffic control simulations)
　　　MiTek Engineering File
.LBA　Liberty BASIC File
.LBG　dBase IV Label Generator
.LBI　Dreamweaver Library File
.LBK　VersaPro Local Logic Block Backup
.LBL　Labels (various)
.LBM　Electronic Arts Deluxe Paint　[XnView] [IrfanView]
　　　XLib Linear Bitmap Graphic
.LBO　dBase IV Ordered Labels
.LBR　Compressed Archive File
　　　Lotus 1-2-3 Display Driver
　　　Omnis7 Application File
.LBS　　Omnis Studio Application File
.LBT　Foxpro Label Memo
.LBX　Foxpro Label
.LBXADD　Libronix DLS Addin
.LBXALV　Logos Bible Software Series X Passage In All Versions
.LBXCBV　Logos Bible Software Series X Copy Bible Verses Style
.LBXCIT　Libronix DLS Citation Format
.LBXCMP　Libronix DLS Company Information
.LBXCOL　Libronix DLS Resource Collection
.LBXCTB　Libronix DLS Custom Toolbar
.LBXDAT　Libronix DLS Data File
.LBXDTP　Libronix DLS Data Type
.LBXLBK　Libronix DLS License Backup
.LBXLIC　Libronix DLS Licenses File
.LBXLLS　Libronix DLS Resource (LLS Format)
.LBXNOT　Libronix DLS Notes
.LBXOEB　Libronix DLS Resource (OEB Format)
.LBXPDF　Libronix DLS Resource (PDF Format)
.LBXPLN　Logos Bible Software Series X Bible Reading Plan
.LBXPLV　Logos Bible Software Series X Parallel Bible Versions
.LBXPRF　Libronix DLS Preferences
.LBXRAS　Libronix DLS Resource Association
.LBXRTP　Libronix DLS Resource Type
.LBXSHL　Libronix DLS Shell
.LBXUPD　Libronix DLS Update Script
.LBXVRS　Logos Bible Software Series X Verse List
.LBXWKS　Libronix DLS Workspace
.LBZ　Leibniz Mathematical Word Processor
.LCD　CDspace CD Emulator
.LCF　Linker Control File
.LCH　PagePath Technologies LAUNCH! File
.LCK　MS Frontpage-related File [Buy Office XP at Shop.Microsoft]
　　　Paradox Lock File
　　　Adobe Pagemaker Database File
.LCL　FTP Software Data
.LCN　WordPerfect Dictionary File
.LCS　ACT! History File
.LCW　Lucid 3-D Spreadsheet
.LD　 Telix Long Distance Codes
.LD1　dBase Overlay File
.LDA　LaserData　[XnView]
.LDB　MS Access Lock File [Buy Office XP at Shop.Microsoft]
　　　TrueVector Log Database
　　　Settler for Windows Temporary File
.LDD　Laser Dispatch Data
.LDF　LuraDocument File　[XnView] [IrfanView]
　　　Geoworks Glue Library Definition
　　　MS SQL Server Transaction Log File
.LDL　Corel Paradox Delivered Library
　　　OzWin CompuServe E-mail/Forum Access Download Request
.LDR　LDraw Model File
.LDS　Laser Dispatch Script
　　　Trane Trace Load
.LEG　Legacy Graphic Format
.LEN　PlatePrep (output on flexo plates)
.LEP　Label and Envelope Designer Plus 2000
.LES　Learn Lesson File
　　　Mklesson Lesson File
　　　Logitech Entertainment Game Profile
.LET　Letter

.LEV　Worms Armageddon Map
　　　Worms World Party Map
　　　NetHack Level File
.LEX　Lexicon (dictionary file - many)
　　　Lexmark Printer Install File
.LFA　LifeForm File
.LFF　LucasFilm Format　[XnView]
.LFL　LucasFilm Library
.LFM　LifeForm File
.LFP　LifeForm File
.LFQ　LeechFTP Queue File [also see BitBeamer]
.LFT　Chiwriter Laser Printer Font
　　　3D Studio Loft File
.LFXM　FaceMail Text to Speech E-mail (Site Requires Application Download!)
.LG　 Logo Procedure Definition
.LGC　Program Use Log File (for Windows Program Use Optimization)
.LGF　legal Eagle Text File
.LGO　MS Windows Logo Driver
　　　SuperFax Header/Footer Logo
.LGP　Logotron SuperLogo File
.LGT　Urban Chaos Game File
　　　The Sims (Maxis) Lighting File
.LHA　Compressed Archive File (LZH format; LHA.EXE)
　　　Compressed Archive File (LHARC.EXE)
　　　Compressed Archive File (LHARK.EXE)
.LHS　Literate Haskell Source File
.LHW　Compressed Amiga Archive File
.LHZ　LHA Compressed Archive File
.LIB　Program Library (diverse programmers' languages and installers)
　　　Greeting Card Library (e.g., KEY Greeting Card Designer)
　　　Library Used by an Application (e.g., EndNote Library)
.LIC　License File (various Shareware)
.LID　WinDVD File
.LIF　Compressed Archive File
　　　HP Logical Interchange Format File
　　　Homeworld Texture　[XnView]
.LIM　Limit Compressed Archive
.LIN　AutoCAD Line Art
　　　VAX Program Listing
.LIQ　CollegeBAR Bartending Software Liquor Cabinet
.LIS　VAX Program Listing
　　　Structured Query Reporting (SQR) Output
.LIT　MS Reader EBook File
.LIV　LiveMotion SWF Movie (also called Bigshot Movie)
.LIVEREG　Symantec Norton Anti-Virus Update Session
.LIVESUBSCRIBE　Symantec Norton Anti-Virus Update Catalog
.LIVEUPDATE　Symantec Norton Anti-Virus Update File
.LIX　Libronix DLS Resource (LLS 2.x Index)
　　　Extend Simulation Library File
.LJ　 Text File for HP LJ II Printer
.LKO　MS Outlook Express Linked Object [Buy Office XP at Shop.Microsoft]
.LKS　WinAmp Links File
.LL3　LapLink III Document File
.LLB　LabView File
.LLC　LapLink Saved Connection File
.LLP　VersaPro Local Logic Block
　　　Digital Chart of the World Data File
.LLT　Digital Chart of the World Data File
.LLX　Laplink Exchange Agent
.LM8　Picture File
.LMD　Tune Smithy List of Modes for a Musical Scale
.LML　LOGML File (Log Markup Language)
.LMU　RPG Maker 2000 (map included in an RPG game)
.LNB　Logomanager File
.LND　3D Landscape Data
.LNG　Diablo II File
　　　NRG SDR Language File
.LNK　Linker File
　　　Windows Shortcut File
.LMP　Quake File
.LNS　LinkStash Bookmark File
.LOC　Suppose Locations File
.LOD　Load File (various)
.LOG　Log File (many different programs - usually an ASCII text file)
.LOGONXP　LogonStudio File (customizes the WindowsXP Logon screen)
.LOK　FileWrangler/ZipWrangler/SecurDesk! Encrypted Archive
.LP　 LP88 Linear Programming for the IBM-PC File
　　　Lightscape Preparation File
　　　FlexRip/B (Print Control and Press Behavior)
.LP3　Hansen Software Label Printer (ver 1.0 - 2.1)
.LP4　Hansen Software Label Printer (ver 3.x)
.LPA　LPA-View Laser Particle Analyser Test Analysis Software
.LPB　LP88 Linear Programming for the IBM-PC File
.LPC　Teko Printer Driver
.LPD　Helix Nuts and Bolts File (Helix Software now part of McAfee)
　　　Avery Label Pro
.LPI　Live Pictures
.LPN　LVPlan - Planification of Low Voltage Aerial Distribution Networks
.LQF　Leech FTP Save Queue File
.LQP　Liquid Audio Player Passport File
.LQT　Winamp File
　　　Liquid Audio Player File
.LRC　Intel Video Phone File
.LRF　MS C/C++ Linker Response File
.LRM　Microsoft Encarta Class Server Learning Resource
.LRS　WordPerfect Language Resource File
　　　Daylon Leveller Rendition Style (data used for visualizing heightfields)
.LS　 Lightscape Solution File
　　　Freeware Dictionary Project Data File
.LS1　OzWin CompuServe E-mail/Forum Access Library Listing
.LSA　Liquid Audio Player Skin File
.LSC　Tune Smithy List of Muscial Scales
.LSD　RPG Maker 2000 Saved Game File
.LSE　Nokia Audio Manager
.LSF　Streaming Audio/Video File
　　　Libronix DLS Resource (LLS 2.x)
.LSG　MS LocStudio Glossary
.LSL　Corel Paradox Saved Library
　　　Lotus Script Library
　　　Daylon Leveller Shape List (3D geometry for heightfield vector objects)
.LSO　Logic Audio File
.LSP　LISP Program File
.LSQ　VAX CRYSTALS Chemical Crystallogaphy File
　　　CalTech PaleoMag Least Squares Format
.LSR　Logos Library System 2.x Standard Reference Definition
.LSS　Legato Spreadsheet
.LST　Listing or List (e.g., packing list)
　　　PowerPoint File [Buy Office XP at Shop.Microsoft]
　　　Ingres Dump List File
　　　OzWin CompuServe E-mail/Forum Access Library Listing
　　　1st Reader Keyboard Macro
　　　Oracle Spool File
　　　Family Tree Maker Error File
.LSX　Streaming Audio/Video Shortcut
.LT2　Curious Labs Poser Lighting File
.LTG　Lasertank Bitmap Graphics
.LTH　Sierra Print Artist Letterhead
.LTM　Lotus Form
.LTR　Letter
　　　ACT! (DOS version) Letter File
.LTT　SDR99 Speech Recognition Task Lexical TREC Transcription
　　　HP Library and Tape Tools Log File
.LU　 ThoughtWing Library Unit File
.LUA　Lua Source
.LUL　OzWin CompuServe E-mail/Forum Access Upload
.LUP　OzWin CompuServe E-mail/Forum Access Library Update
.LVL　Parallax Miner Descent/D2 Level Extension
　　　Lasertank Level
　　　Max Payne Uncompiled Level File [Added Info]
.LVP　Lucent Voice Player (Intuity Audix Multimedia Messaging System)
　　　LView Pro　[XnView]
.LVS　Daylon Leveller Selection Mask
.LVW　Daylon Leveller View File
.LW3　Lightwright File (spreadsheet/database to manage professional lighting design paperwork)
.LWA　LightWorks Archive (LWA) Material/Scene File
.LWC　Living Word Commentaries Bible File
.LWD　LotusWorks Text Document
.LWF　LuraWave-compressed Graphic File　[XnView] [IrfanView]
.LWI　LightWorks Image　[XnView]
.LWO　NewTek Lightwave® Object
.LWP　Lotus Wordpro 96/97 File
.LWS　NewTek Lightwave® Object Layout
.LWV　MS Linguistically Enhanced Sound File
.LYR　DataCAD Layer File
　　　Song Lyric File [On-line Guitar Archive]
.LYT　TurboTax Log File
　　　SignMaking Application Extension
.LYX　LyX (WYSIWYM document processor)
.LZD　Binary Difference File
.LZH　Compressed Archive File (LHARK.EXE)
　　　Compressed Archive File (LHARC.EXE)
.LZS　Compressed Archive File
　　　Skyroads Data File
.LZW　Compressed Amiga Archive File
.LZX　Compressed File
.M　　Matlab Function
　　　Brief Macro Source
　　　Mathematica File
　　　Limbo Interface Declaration (Inferno OS)
　　　Cliq Accessories Datebook Modification File [Linux Suite PDF Description]
　　　Desktop Color Separation Specification Magenta Layer (usually an EPS file)
.M_U　MazeGold Critical File Backup
.M??　Ingres Modify Table/Index File (?? = Hex 00 to FF)
.M$S　MindStor Firmware Update File (M$A$W.M$S)
.M11　MASS11 Text File
.M12　Proprietary Data Format for Interchange of Defense Form Data with Mil-Pac Technology Software Products (link is PDF file)
　　　S-BASIC File
　　　Hydrographs Synthesis Project File
　　　SHARP MZ-series Emulator File
.M15　Apple MPEG-1 Video
.M18　Accolade Golf Course File
.M1A　Apple MPEG-1/2 Audio
.M1V　MPEG-1 Video File
.M2A　Apple MPEG-1/2 Audio
.M2P　MPEG-2 Program Stream Format File
.M2S　MPEG-2 Audio and Video (system stream)
.M2V　MPEG-2 Video Only File
.M3　 Modula 3 Program File
.M32　Dr.T MIDI File
.M3A　MPEG Archive Enhanced .M3U Playlist File
.M3D　3D Animations Macro
　　　Corel Motion 3D Animation
　　　EverQuest File
.M3S　Myst III Exile Saved Game
.M3U　MP3 Playlist File [WinAmp] [MattBatt iAM-player]
.M4　 UNIX M4 Preprocessor File
.M75　Apple MPEG-1 Video
.M8　 Heretic II MipMap　[XnView]
.MA　 Maya File (ASCII)
　　　Diablo II Map File
.MA3　Harvard Macro (Harvard Graphics taken over by Serif)
.MAC　MacPaint Bitmap Graphic　[XnView]
　　　Macro (various)
.MACP　MacPaint Bitmap Graphic　[XnView]
.MAD　MS Access Module Shortcut [Buy Office XP at Shop.Microsoft]
　　　Game Movie File (unverified)
.MAF　MS Access Form Shortcut [Buy Office XP at Shop.Microsoft]
.MAG　MPS Magro Paint System Graphic
　　　MS Access Diagram Shortcut [Buy Office XP at Shop.Microsoft]
　　　MAGIchan Graphic　[XnView]
.MAI　VAX Mail
.MAK　Make File (compiler project file)
.MAM　MS Access Macro Shortcut [Buy Office XP at Shop.Microsoft]
.MAN　Manual (often an ASCII text file)
　　　Windows 2000 Mandatory User Profile (C:/DOCUMENTS AND SETTINGS/USERNAME/NTUSER.MAN)
.MANIFEST　MS Visual Stylesheet for Windows Forms (Text file)
.MAP　Image
　　　Server-side Image Map (allows one to map link locations in a Web graphic)
　　　Color Palette
　　　AccView Network Map
　　　Atlas MapMaker Map
　　　DIV Game Studio Map　[XnView]
　　　Fenix Map　[XnView]
　　　Ingres Termcap Mapping File
　　　Poser 3D Map File
　　　WorldCraft Quake/Half-Life Game Level File
　　　Blood Game File Map
　　　Duke Nukem Game Level Data File
　　　　...and many more games (too many to list)
　　　Linker Map
　　　Micrografx Picture Publisher Format Data
　　　PROGNOSIS Map Document File
.MAPIMAIL　MS Outlook Express Mail File
.MAQ　MS Access Query Shortcut [Buy Office XP at Shop.Microsoft]
.MAR　MS Access Report Shortcut [Buy Office XP at Shop.Microsoft]
　　　VAX Macro Assembly Program
　　　Bibliographic Data Format (usually .MRC)
.MAS　Focus Master Data Definition
　　　MS Access Stored Procedures [Buy Office XP at Shop.Microsoft]
　　　Lotus Freelance Graphics Smartmaster File
　　　QuickCard File
.MAT　Sound File
　　　Pro/Engineer Material Properties File
　　　Matlab Variables Binary File
　　　MS Access Table Shortcut [Buy Office XP at Shop.Microsoft]
　　　Autodesk 3D Studio Max and Viz File
　　　Poser 3D Pose File
.MAUD　Sound File [Linux Player]
.MAV　MS Access View Shortcut [Buy Office XP at Shop.Microsoft]
.MAW　MS Access Data Access Page
.MAX　Kinetix's 3D Studio MAX Scene
　　　Autodesk 3ds Max Scene File
　　　Maximizer Contact & E-business Program
　　　Paperport Scanned Image [Viewer]
　　　Max Source Code
　　　OrCAD Layout File
.MAZ　Hover Maze Data
　　　Division's dVS/dVISE File
.MB　 Paradox Memo Holder
　　　Maya Binary (3D Software Maya Scenes)
.MB1　Apogee Monster Bash Data File
.MBD　Multimedia Builder MP3 Authoring File
.MBF　MS Money Backup File
.MBFS　Stardent AVS X Image　[XnView]
.MBFAVS　Stardent AVS X Image　[XnView]
.MBG　Mailbag Assistant E-mail Archive
.MBK　dBase IV Multiple Index Backup
　　　VersaPro Motion Block Backup
.MBM　SymbianOS Multi BitMap Image (native EPOC image format)　[XnView]
.MBS　Mailbag Assistant Script
.MBT　ecBuilder Template (Web site cataloging)
.MBW　MarketBrowser (investment charting/analysis)
.MBX　Mailbox Message File (Outlook v1-4 or Eudora and others)
.MC　 MetaCard Script
　　　PlaySaver and PSEmuPro Memory Card Save and Single Game Save
.MC8　Mastercam 8 File
.MCA　i-deas Web ACCESS File
.MCC　Mathcad Configuration
　　　Mylar City Character Editor
　　　Dialer10 Calling Card
　　　Monu-Cad Pro CAD File
　　　VectorWorks/MiniCAD File [Viewer]
　　　Incite Media Assistant File
.MCD　Mathcad Document
　　　Craig McDowall.com NotePad
　　　Monu-Cad Pro CAD File
　　　Bleem! Memory Card Save
.MCF　Mathcad Font
　　　Meta Content Format File (describes a Web site) [Process description]
　　　Master Command File
　　　TMPGEnc Template (Multimedia Container Format File)
.MCH　Macromedia Xtra Cache File
.MCI　Media Control Interface Command Set
.MCL　Multimedia Manager Collection File
　　　Macro Command Language (Symbol handheld terminals)
.MCP　Mathcad Printer Driver
　　　Capsule Application Script
.MCQ　McAfee Quarantined File
.MCR　DataCAD Keyboard Macro File
　　　PlaySaver and PSEmuPro Memory Card Save and Single Game Save
　　　CuteFTP Script
.MCS　MathCAD Format File
.MCT　Musicator
.MCW　MacWrite II Macintosh Text File
.MCX　Graphic File
.MD　 Compressed Archive File
　　　Teknical eLearning Objects Meta-Data File (stores info on related file)
.MD1　Gear CD Suite File
.MD5　MD5summer (generates and verifies md5 checksums) [MD5 Generator] [fsum Checksum Utility]
.MDA　MS Access Add-in
　　　MS Access 2 Workgroup
.MDB　MS Access Database
　　　MS Access Application
　　　Mediator Multimedia Data
.MDE　MS Access Database File
.MDF　Menu Definition File
　　　MS-SQL Master Database File
　　　Accelio Capture Classic (JetForm) Filler (JetForm Corp became Accelio 12 Sep 2001)
　　　I-deas Master Drafting Machine Data File
.MDL　Digitrakker Music Module (by n-FaCToR)
　　　Rational Rose
　　　Quake Model File
　　　3D Design Plus Model
　　　Simulink Simulation Model
　　　ASTi Model Builder File
　　　CA-Compete! Spreadsheet
　　　Half-life Model　[XnView]
　　　Moray Model (wireframe modeller supporting POV-Ray 3.1)
　　　Symbian OS MIME Type Library
.MDM　Telix Modem Definition
.MDMP　WinXP Trouble Report (extension is added to file sent)
.MDN　MS Access Blank Database Template [Buy Office XP at Shop.Microsoft]
.MDO　MS Internet Information Server Configuration Backup
.MDP　MS Developer Studio Project
.MDR　FaxTalk Modem Doctor Modem Report File
.MDS　Media Description File [Fantom CD Emulator]
.MDT　MS Access Add-in Data [Buy Office XP at Shop.Microsoft]
　　　MS ILink Incremental Linker Data Table
.MDW　MS Access Workgroup Information [Buy Office XP at Shop.Microsoft]
.MDX　dBase IV Multiple Index [File Structure]
　　　Avery Label Pro Re-Index File
.MDZ　MS Access Wizard Template [Buy Office XP at Shop.Microsoft]
.ME　 Information (e.g., READ.ME)
.MEA　Meazure File (screen measurement and capture utility)
.MEB　WordPerfect Macro Editor Bottom Overflow File
.MED　WordPerfect Macro Editor Delete Save
　　　OctaMED Tracker Module
.MEL　Ericsson Phone Melody
　　　Maya Embedded Language Script
.MEM　WordPerfect Macro Editor Macro
　　　Memory File of Variables
　　　MS FoxPro Memory Variable Save File
.MEN　Menu
.MEQ　WordPerfect Macro Editor Print Queue
.MER　WordPerfect Macro Editor Resident Area
　　　Data Interchange Format
.MES　Message File
　　　WordPerfect Macro Editor Work Space
.MET　WordPerfect Macro Editor Top Overflow File
　　　Presentation Manager Meta File
　　　OmniPage Document
　　　eDonkey2000 File
.METHODS　Likely a text file (e.g., README.METHODS)
.MEU　DOS Shell Menus
.MEX　Matlab Executable Command
　　　WordPerfect Macro Editor Expound File
　　　mexReader Multimedia File
.MEZ　RealArcade Game Information
.MF　 MetaFont Text File
.MFA　MS Site Server 3.0 Report Definition
.MFF　MIDI File Format
.MFG　MediaForge Runtime Player
.MFM　VTeX Multiple Master Font Metrics (a variant of the Adobe Font Metrics (AFM) format?)
.MGC　MGCSoft Equation Editor File
.MGCF　MagicInstall Compressed File
.MGD　Master Grade Gradebook
.MGF　Image File
　　　Micrografx Font
　　　Materials and Geometry Format File
.MGL　MosASCII Graphics Library
.MGM　MGCSoft Equation Editor Macro File
.MGR　MGR Bitmap　[XnView]
.MGX　Micrografx Picture Publisher Clipart
.MGZ　Metal Gear Solid Archive　[Dragon UnPACKer]
.MH　 Graphic File
.MHG　Multimedia File
.MHK　Riven Movie Data File (Mohawk Archive)
.MHP　MS Home Publishing Project
.MHT　MS MHTML Document (Archived Web Page)
.MHTML　MS MHTML Document (Archived Web Page)
.MI　 Miscellaneous
　　　CoCreate CAD File
.MIB　Management Information Base File (SNMP Management Programs)
.MIC　MS Image Composer File
.MID　MIDI File　[IrfanView]
.MIDI　MIDI File　[IrfanView]
.MIF　MIDI Instrument
　　　Adobe FrameMaker Interchange Format
　　　Software License Tracking Tool (CERTAUTH.MIF)
　　　MapInfo Interchange Format File
　　　MicroHof .MIF Assembler File
　　　Image Magick File　[XnView]
.MIFF　Image Magick File　[XnView]
.MII　MicroStat II Data File
.MIL　Group 4 Fax File
　　　Micro Illustrator Uncompressed Graphic　[XnView]
.MIM　Multi-Purpose Internet Mail Extensions (MIME) File　[MIME]
.MIO　mexReader Multimedia File
.MIP　Paint Shop Pro Multiple Image Print File
.MIS　Delta Force Land Warrior Mission [Fan site]
　　　Tribes 2 Game File
　　　MagicInstall Installation Script　(Under development Feb 2002)
.MIX　Power C Object File
　　　Multilayer Picture File (MS PhotoDraw 2000 & MS Picture It!)
　　　Don Knuth's MIX Emulator
　　　Command & Conquer Movie/Sound File
　　　Techno eJay Music Mix File
　　　OzWin CompuServe E-mail/Forum Access Index File
.MJ　 MovieJack DVD Ripper File
.MK　 Make File
.MKD　Malz++Kassner CAD5 Drawing
.MKE　Make File
.MKI　Picture File
.MKL　Malz++Kassner CAD5 Drawing Library
　　　Cr閍toria
.MKS　Tact Data
.ML3　Milestones 3.x Project
.ML6　PowerPoint Milestone File
.MLB　Macro Library
.MLD　Multilizer Dictionary
.MLI　Encyclopedia Media List
　　　3D Studio's Material-Library File
.MLK　Sierra Mastercook File
.MLM　Novel Groupwise E-mail File
.MLS　Miles Sound Tools Compressed DLS
.MM　 Macro Mania Macro
　　　Multimate Advantage File
　　　Lightscape Material Map
.MMB　MultiMedia Builder
　　　Oracle Forms Menu Binary Source Code
.MMC　Media Catalog
　　　MSoffice Media Content (MS OfficeXP)
.MME　Multi-Purpose Internet Mail Extensions (MIME) File　[MIME]
.MMF　Meal Master Format
　　　MS Mail File
.MMI　Memo Open Client
.MML　Mail Meta Language
.MMM　Animation MS Multimedia Movie
　　　MacroMind Directory RIFF/RMMP Format Movie
.MMO　RapidFile Memo Writer
.MMP　MindManager Map File
　　　Gammadyne Mailer Project File
　　　Bravado Board Video Output Format
.MMPBT　MindManager Branch Template File
.MMPT　MindManager Template
.MMS　Miles Sound Tools (Midi+DLS/MLS)
.MMSCRIPT　MindManager Script File
.MMT　Nimbus 7 SAMS Data File (monthly mean retrieved temperatures)
.MMV　Sony MovieShaker File
.MMW　Microsoft Media Content
.MMX　Command & Conquer Red Alert 2 Map File
　　　Oracle Forms Compiled Menu
.MMZ　MusicMatch Theme File
.MN2　Descent2 Mission File
.MN3　Descent3 Mission File
.MN4　Microsoft Money Database (older version)
.MNB　MuPAD File
.MNC　My Notes Center File
.MND　AutoCAD Menu Program File
　　　MNI Mandelbrot for Windows
.MNG　Animation Shop Animation
　　　DeLorme Map'n'Go Map
　　　Multi-image Network Graphic　[XnView]
.MNO　Monopoly Saved Game
　　　Macromedia Design Notes
.MNR　AutoCAD Compiled Menu File
.MNS　AutoCAD ASCII Menu File
.MNT　Foxpro Menu Memo
.MNU　Menu File (various)
　　　HP NewWave Advanced Macro
.MNW　Menu File (various)
.MNX　AutoCAD Compiled Menu File
　　　Foxpro Menu
.MNY　MS Money File
.MOB　Device Definitions
.MOD　Music File (various)
　　　Model File (various)
　　　Modula-2 Program File
　　　ProModel Optimization Software Suite Model
　　　Windows Kernel Module
　　　Amiga and PC Tracker Module
　　　MS Multiplan Spreadsheet
　　　Monarch File (data mining)
.MODEL　Catia File
.MOL　MDL Molfile (MIME type chemical/x-mdl-molfile) [Requires Chime Plug-in]
　　　Easy Palette Object Library
.MON　ReadMail Monitor (UNIX)
.MOP　Mopac Input File (MIME type chemical/x-mopac-input)
.MOR　Poser 3D Morph Target File
.MOV　QuickTime Video Clip　[IrfanView]
　　　Apple QuickTime Audio
　　　AutoCAD AutoFlix Movie
.MOVERADDIN　　 Mover (Inventory Management) Add-in
.MOVERBACKUP　　Mover (Inventory Management) Backup Set
.MOVERCONFIG　　Mover (Inventory Management) Configuration
.MOVERDB　　　　Mover (Inventory Management) Database
.MOVERREG　　　 Mover (Inventory Management) Registration Info
.MOVERTEMPLATE　Mover (Inventory Management) Template
.MOVIE　Video
.MOX　Extend Simulation Model File
.MOZ　Netscape Temp File
.MP　 Multiplan File
　　　Maya Personal Learning Edition File
　　　EARS Component File (EARS = UK Liberal Democrats Election Agents Record System) [Filename starts with E]
.MP+　MpegPlus Audio File (replaced by .MPC)
.MP1　MPEG Audio Stream, Layer I
.MP2　MPEG Audio Stream, Layer II
.MP2V　MPEG Audio Stream, Layer II
.MP3　MPEG Audio Stream, Layer III　[IrfanView]
　　　SHARP MZ-series Emulator File
.MP4　iVAST MPEG-4 (hold BIFS-Binary Information For Scene representation) [MPEG-4 Industry Forum]
.MPA　MPEG Audio Stream, Layer I, II or III
　　　Palm Memo File
.MPC　MS Project Calender
　　　MP3 Collector Collection Manager File
　　　VersaPro Compiled Motion Block
　　　Musepack Audio File (new format replacing .MP+)
.MPD　Mini Port Driver
　　　MS Project Database File
.MPDEX　MPdex MP3 Database Utility
.MPE　MPEG Movie Clip
.MPE.EXE　MP3 Digital Player Wrapper
.MPEG　MPEG Movie
.MPF　MS Design Gallery
　　　MosASCII Project Workspace File
.MPG　MPEG Animation　[IrfanView]
　　　MPEG 1 System Stream
.MPGA　Mpeg-1 Layer3 Audio Stream
.MPH　MS Publisher
.MPJ　RoboHTML Project
　　　Mountain Video Editing File　(Atari)
.MPK　Augmented MS-Project File
.MPM　WordPerfect MathPlan Macro
　　　Max Payne MOD Archive [Added Info]
.MPNT　MacPaint Bitmap File　[XnView]
.MPO　Augmented MS-Project File
.MPP　MS Project File
　　　CAD Drawing File
.MPQ　Blizzard Game Data File
　　　　(also other games)
.MPR　Foxpro Program
　　　Westwood Studios Game File (e.g., Red Alert, et.al. - should be a text file)
　　　FileMaker Spelling Dictionary
.MPS　Multimedia File
　　　MPEG-1 Audio and Video File (system stream)
　　　Casio PDL Pocket Streets Map (Microsoft product - see just below)
　　　MS Pocket Streets Map File
　　　Max Payne Saved Game
　　　Garmin Mapsource GPS Mapping Interface
　　　MySweetNix! (change MSN Messenger Service nickname every n seconds)
.MPT　MS Project Template File
　　　Multipage TIFF Bitmap
.MPV　MS Project View
　　　MPEG-1 Video File
.MPV2　MPEG Audio Stream, Layer II
.MPW　MosASCII Project Workspace File
.MPX　Foxpro Compiler Menu
　　　MS Project Export File
　　　RCA/Lyra Handheld MP3 Player File (secure MP3 format that only plays in this player)
.MRB　MS C++ Multiple Resolution Bitmap Graphic
.MRC　MIRC Script File
　　　Bibliographic Data Format
.MRF　Marks Russel File　[XnView]
.MRI　MRI Scan
.MRK　Informative Graphics Markup File
.MRO　SharpEye Music Reader File
.MRS　WordPerfect Macro Resource File
.MRW　Minolta Diamage RAW Graphic (use view software supplied with camera)
.MS　 Checksum File for Anti-Virus
.MS1　OzWin CompuServe E-mail/Forum Access Message File
.MS3D　MilkShape 3D Model
.MSA　Magic Shadow Archive
.MSC　Microsoft Common Console Document
　　　MS C Makefile
.MSF　Multiple Sequence File　(biomedical analysis)
.MSG　Program Message
　　　OzWin CompuServe E-mail/Forum Access Message File
　　　MS Mail Message
.MSH　MASH (The Microsoft Agent Scripting Helper)
.MSI　Windows Installer File (associates components with features and contains installation control info)
.MSK　Autodesk Mask File
　　　PaintShop Pro Mask File　[XnView]
.MSM　MultiSIM Circuit Diagram
.MSN　MS Network Document (possibly nicknames)
　　　Descent Mission File
.MSO　MS Word OLE Web Page Storage Stream [Buy Office XP at Shop.Microsoft]
　　　MS FrontPage File [Buy Office XP at Shop.Microsoft]
　　　Math Script Object File
.MSP　MS Paint Graphic File　[XnView]
　　　Windows Installer Patch
　　　Magix Music Studio File
.MSPX　Related to Microsoft's .NET (still researching)
.MSR　OzWin CompuServe E-mail/Forum Access SYSOP File
.MSRCINCIDENT　MS Remote Assistance Request
.MSS　Manuscript Text File (various)
　　　Game Score
.MSSYTLES　Windows Visual Style File
.MST　Minispecification
　　　DATAIR Pension System Master File
　　　Windows SDK Setup Transform Script (contains mods to apply to package during installation)
　　　ChemFinder Chemical Structure Index
　　　Visual Test Source File
.MSW　Word Text File [Buy Office XP at Shop.Microsoft]
.MSWMM　Microsoft Windows Movie Maker Project (Part of WinME & XP)
.MSV　Sony Memory Stick Format
.MSW　MS Word Text File
.MSX　Compressed CP/M File Archive
.MTA　MS Flight Simulator Maintenance File
.MTB　MINITAB Exec File (a macro file)
.MTD　Digital Sheet Music [Viewer]
.MTF　Darkstone Archive　[Dragon UnPACKer]
　　　MicroSurfer File (Link manager/accelerator)
.MTH　Derive Math File
.MTK　Matrikon Software License File
.MTL　MathLook File
.MTM　Sound File
　　　MultiTracker Music Module
.MTP　L&H Power Translator Pro
.MTV　MTV Ray-tracer　[XnView]
.MTW　Minitab Data File
.MTX　Temporary File often used by a browser or TWAIN device
.MU　 Quattro Menu
.MUC　Music Collector Collection Manager File
.MUF　ProtoMuck Multi User Forth Program
.MUL　Ultima Online Game
.MUP　Music Publisher File
.MUS　MusicTime Audio File
　　　Finale Music Score
　　　Harmony Assistant, Melody Assistant, Myriad Music plug-in, Melody Player
.MV　 Miva Script
.MV3　Oozic 3D MusicVideo
.MVA　Matrox Video Card Driver
.MVB　Database
　　　MS Multimedia Viewer File　[Viewer Download]
　　　　Note: The viewer download is old. Don't overwrite any new files with old.
.MVC　Music Collector Collection Manager File
.MVD　MicroDVD DVD Movie
.MVE　Interplay Video File [Descent2]
.MVF　Movie Stop Frame File
.MVI　AutoCAD Movie Command File
.MVW　Saber LAN Log File
.MW4　MechWarrior 4 Map
.MWD　Photo Soap2 File
.MWF　ProMotion Animation
　　　Autodesk MapGuide Author Map Window File
.MWM　Mail Warrior File
.MWP　Lotus Wordpro 97 Smartmaster File
　　　MegaWorks Pack File　[Dutch]
.MWS　Maple Spreadsheet
.MWV　MovieWorks File
.MX3　Bitbop Tuner Locked Sound File
.MXD　GIS Project File (map information)
.MXE　Macro Express
　　　Mindex Effect Album
.MXI　Proteus File (personal light and sound stimulation system)
　　　Macromedia Extension Information
　　　Mindex Indices file for Indexed Images
.MXM　MS Project/Outlook Team Assign Task
　　　Mindex Master Index File for a Category
.MXP　Macromedia Extension Manager
　　　ArcReader Published Map
.MXT　MS C
　　　ArcMap Map Template
.MYD　MySQL Data File
.MYI　MySQL Data File
.MYDOCS　MyDocs Drop Target
.MYP　Make Your Point Presentation
.MYS　Myst Saved Game
.MYW　MyWorld Education Drawing
.MZ　 MOZART Music Document
.MZB　MegaZeux Board
.MZF　SHARP MZ-series Emulator File
.MZP　MOZART Percussion File
.MZQ　SHARP MZ-series Emulator QuickDisk File
.MZS　SHARP MZ-series Emulator File
.MZT　MOZART Template File
　　　SHARP MZ-series Emulator File
.MZX　MegaZeux World

.N1E　OM2 OMALI NENA Encrypted Document Version 1
.N2E　OM2 OMALI NENA Encrypted Document Version 2
.N2P　Net2Phone File
.N3E　OM2 OMALI NENA Encrypted Document Version 3
.N4E　OM2 OMALI NENA Encrypted Document Version 4
.N64　Nintento 64® Emulation ROM Image
　　　MiMiX Emulator
.NA2　Netscape Communicator Address Book
.NAB　Novell Groupwise Address Book
　　　Netscape Communicator Address Book
.NAD　Noder File (Polish)
.NAI　WinINSTALL File
.NAM　MS Office Name File (often DISPLAY.NAM - text description)
.NAN　Nanoscope File
.NAP　NAP Metafile Vector Image
　　　Napster Music Security Definition File　[How It Works]
　　　EnerGraphics VideoShow File
　　　Electrical Network Analysis and Planification
.NASB　TheWord & Bible Companion New American Standard Bible
.NAV　MSN Application Extension
.NB　 Nota Bene Text File
　　　Mathematica Notebook
.NC　 Graphics File
　　　Numerical Control Machine Instructions
.NCB　MS Developer Studio File
.NCC　Computer Numeric Control File
　　　NetControl V1 1999 (freeware network health probe)
.NCD　Norton Change Directory
　　　NTI CD-Maker File
　　　CoverDesigner　[XnView]
.NCF　Netware Command File
　　　Lotus Notes Internal Clipboard
.NCH　Outlook Express Folder File [Buy Office XP at Shop.Microsoft]
　　　On Hold Message/Music File
.NCR　NCR Image　[XnView]
.NCT　CoverDesigner　[XnView]
.NDB　Intellicom Network Database
.NDL　Lotus Notes
.NDO　3D Low-polygon Modeler
.NDS　Indiana Jones and the Infernal Machine Saved Game
.NDX　Index (usually dBase compatible) [File Structure]
.NE1　OM2 OMALI NENA Document Version 1
.NE2　OM2 OMALI NENA Document Version 2
.NE3　OM2 OMALI NENA Document Version 3
.NE4　OM2 OMALI NENA Document Version 4
.NEB　Nortec H.E.L.P. (humidity calculations)
.NED　MSN Application Extension
.NEF　Raw Graphic File Format for Nikon Digital SLR Cameras　[XnView]
.NEO　Neochrome (ST & TT)　[XnView]
.NES　Nintendo Entertainment System ROM Image
.NET　Network Configuration
　　　OrCad Netlist Output File
.NEW　New Information (e.g., WHATS.NEW)
.NEX　Nexcon System File (Nexcon is a shell replacement)
.NFF　WorldToolKit Neutral File Format [Format]
.NFO　Folio Infobase
　　　Text File [Open in text editor]
　　　MS System Info File (XML format)
　　　Warez Group Info File
.NG　 Norton Guide Online Documentation
.NGF　Enterasys Networks NetSight Generated Format File
.NGG　Nokia Group Graphics　[XnView]
.NGS　NGSSniff File
.NH　 NetHack Defaults File (defaults.nh and/or NHAccess.nh)
.NHF　Nero HFS-CD Compilation
　　　Nero File (CD burning/design software)
.NICK　Office Data File
.NIL　Norton Icon Library File
.NIF　NetImmerse File Format
.NITF　National Imagery Transmission Format　[XnView]
.NIV　TheWord & Bible Companion New International Version Bible
.NJP　njPipes Compiler File (generally java or NetRexx code)
.NJX　NJStar Document
.NK2　Office Data File
.NKJV　TheWord & Bible Companion New King James Version Bible
.NLB　Oracle 7 Data
.NLD　ATI Radeon Video Driver File
.NLM　Netware Loadable Module
　　　LogoManager for Nokia Phones (format for Nokia phone images)　[XnView]
.NLS　Code Page National Language Support
.NLTRACK　NoLimits Rollercoaster Simulator Track File
.NLU　Norton Live Update E-Mail Trigger File
.NLX　FormWorx Form
.NMA　Normalised Extinction Corrected Differential Photometry
.NMD　SwordSearcher File
.NMI　SwordSearcher File
.NMO　Virtools Behavioral Objects
.NMS　Numega Softice's Loader File (includes debugging info)
　　　Virtools Graphical Scripts
.NNB　newnovelist Story Outline
.NNI　ANNI Artificial Neural Network Investing
.NOB　VersaPro Word Exchange File
　　　Vampire: La Mascarade Archive　[Dragon UnPACKer]
.NOD　Noder File (Polish)
.NOL　Nokia Operator Logo　[XnView]
.NON　Star Wars - Tie Fighter Mouse Options
.NOR　ATI Radeon Video Driver File
.NOT　ActiveNote Post-It-Notes
　　　Acrobat Spelling File
.NOW　Text File (e.g., README.NOW)
.NP　 Nokia Planner Project Schedule
　　　Cliq Accessories Notepad Text [Linux Suite PDF Description]
.NPD　Noder File (Polish)
.NPI　dBASE Application Generator Source
.NPK　MikroTik RouterOS Upgrade Package
.NPL　DART Pro 98 Noiseprint Info
.NPM　Nokia Picture Message
　　　Neopaint Mask　[XnView]
.NPT　DART Pro 98 Noiseprint Archive Import
.NRA　Nero Audio-CD Compilation
　　　Nero File (CD burning/design software)
.NRB　Nero CD-ROM Boot Compilation
　　　Nero File (CD burning/design software)
.NRG　Norton Registration Entries
　　　Nero CD-Image
　　　Nero File (CD burning/design software)
　　　IsoBuster File
.NRH　Nero Hybrid CD-ROM Compilation
　　　Nero File (CD burning/design software)
.NRI　Nero ISO CD-ROM Compilation
　　　Nero File (CD burning/design software)
.NRL　iManage File
.NRM　Nero Mixed-Mode-CD Compilation
　　　Nero File (CD burning/design software)
.NRSV　TheWord & Bible Companion New Revised Standard Version Bible
.NRT　Nokia RingTone
.NRU　Nero UDF/ISO CD-ROM Compilation
　　　Nero File (CD burning/design software)
.NRV　Nero Video-CD Compilation
　　　Nero File (CD burning/design software)
.NS2　Lotus Notes 2 Database
.NS3　Lotus Notes
.NS4　Lotus Notes Database
.NS5　Lotus Notes Domino File
.NSB　Novaschem School Schedule
.NSC　Noder File (Polish)
　　　Windows Media Station File (used to gather info for WMP to play content) [Security patch]
.NSD　NRG Site Database
.NSF　Lotus Notes Database
　　　NES Sound File　[Winamp (plugin), Meridian, Nosefart]
.NSG　Lotus Notes
.NSH　Lotus Notes
.NSI　Nullsoft Install System Script
.NSO　NetStudio Easy Web Graphics File
.NSP　Multi-Speech Sound File
.NST　Audio File
　　　Noise Tracker Music Module
.NSX　HiPer-Six Index File
.NT　 Windows NT Startup File
.NTF　Lotus Notes Database Template
.NTO　NTOScanner (TCP port scanner)
.NTP　Neato CD Labels
.NTR　Netrun Executable Text File
.NTS　Norton Tutorial
　　　Netsend Executable Text File
.NTW　LVNet - Low Voltage Networks Analysis
.NTX　Clipper Index
　　　.NTX Web Audio File
　　　Network Terminal Accelerator Adapter Card Configuration Information
　　　CARIS Marine Navigation Info
.NTZ　InVircible Directory Integrity Information
.NUF　Procomm Plus New User Message
.NUL　Grand Theft Auto (Playstation 2) Game File
.NUM　Guitar Chords in Nashville Numbering System Format [On-line Guitar Archive]
.NV　 Juno Access Number Info File
　　　Visicontrol MVS-20 Non-Volatile Memory Backup File (Ver
　　　A4Tech Scanner Graphic
.PMD　Pagemaker File
.PME　Plazmic Media Engine File
.PMF　ArcReader GIS Mapping File
.PMG　Pagemaker Group File (EPS graphic)
　　　Paint Magic　[XnView]
.PMI　Pegasus Mail Message Folder Index File
.PML　NT4 Performance Monitor Log File
　　　Pegasus Mail Distribution List
　　　PADGen Program Information
　　　Windows Performance Monitor File
.PMM　Pegasus Mail Mail Message Folder
　　　Amaris BTX/2 Program
.PMO　Print Master Gold Text
.PMP　Sony DSC-F1 Cyber-shot [Acdsee]　[XnView]
.PMR　Windows Performance Monitor File
.PMW　Windows Performance Monitor File
.PN3　Harvard Printer Driver (Harvard Graphics taken over by Serif)
.PND　DATAIR Pension System Pending File
.PNF　Precompiled Setup Information (Temporary file seen during installs)
.PNG　Portable (Public) Network Graphic (proposed GIF replacement)　[XnView] [IrfanView]
　　　PaintShop Pro Browser
　　　Fireworks Image File
.PNL　PEERNET Label Designer File
.PNM　PBM Portable Any Map Graphic　[XnView]
.PNR　PEERNET Label Designer File
.PNS　PEERNET Label Designer File
.PNT　MacPaint Bitmap Graphic　[XnView]
　　　Paperport Thumbsview
　　　MarkMail Qwk Reader Pointers
　　　World Data Bank II Country Data File (derived from CIA data)
.PNTG　MacPaint Bitmap Graphic　[XnView]
.PNU　PEERNET Label Designer File
.PO2　STABCAL (stability calculation for aqueous systems) File
.PO3　STABCAL (stability calculation for aqueous systems) File
.PO5　STABCAL (stability calculation for aqueous systems) File
.POC　PocoScript File
.POD　Terminal Velocity Archive　[Dragon UnPACKer]
.POG　Descent2 File
.POH　Optimized Geoworks .GOH File
.POL　Music File
　　　AscToHTM Policy File
　　　Windows Policy File
.POLICY　Java Policy File
.POO　Poo Patrol Game File (unverified)
.POP　dBase Popup Menu
　　　PopMail Message Index
.POS　ProCite Output Styles
　　　QuickPOS IIF File (see IIF above)
.POT　PowerPoint Template [Buy Office XP at Shop.Microsoft]
.POV　Persistence of Vision Ray-tracer
.POW　PowerChords Chord Chart
.PP　 Compressed Amiga Archive File
.PP2　Curious Labs Poser Prop File
.PP4　Picture Publisher
.PP5　Picture Publisher
.PPA　PowerPoint Add-in [Buy Office XP at Shop.Microsoft]
.PPB　WordPerfect Print Preview Button Bar
.PPD　PostScript Printer Description
.PPF　Turtle Beach Pinnacle Program File
　　　Jasc Paint Shop Pro 7 Preset File
　　　Micrografx Picture Publisher File (Micrografx now part of Corel)
　　　PlayStation Patch File
.PPG　MS PowerPoint Ppresentation
　　　Professor Franklin's Photo Print Gold
.PPI　MS PowerPoint Graphics File [Buy Office XP at Shop.Microsoft]
.PPJ　Adobe Premiere Video Editing File
.PPL　Harvard Polaroid Palette Plus ColorKey Driver (Harvard Graphics taken over by Serif)
.PPM　PBM Portable Pixelmap Graphic　[XnView] [IrfanView]
.PPMA　Portable Bitmap　[XnView]
.PPO　Clipper Preprocessor Output
.PPP　Serif PagePlus Publication
　　　Enfocus Preflight Profile
　　　Parson Power Publisher
　　　Punk Productions Picture　[XnView]
.PPR　Cognos PowerPlay OLAP Multidimensional Cube
.PPRINT　Pics Print File
.PPS　PowerPoint Slideshow　[XnView] [Buy Office XP at Shop.Microsoft]
.PPT　PowerPoint Presentation　[XnView] [Buy Office XP at Shop.Microsoft]
.PPX　Serif PagePlus Publication
　　　Cognos PowerPlay OLAP Reporting
.PPZ　PowerPoint Packaged Presentation [Buy Office XP at Shop.Microsoft]
.PQ　 Adobe Pagemaker Default Printer Style
.PQA　Palm Query Application File (database for wireless access)
.PQI　Power Quest Drive Imaging Software
.PQW　Corel Presentations 9 Runtime
.PQX　Power Quest DRive Image Index
.PR　 EROSION 3D Precipitation Parameters [Format (pdf)]
　　　Sun Icon/Cursor　[XnView]
.PR1　OzWin CompuServe E-mail/Forum Access Purged Message File
.PR2　Persuasion Presentation
　　　dBase IV Printer Driver
　　　Proteus Session (personal light and sound stimulation system)
.PR3　dBase IV PostScript Printer Driver
　　　Aldus Persuasion Presentation
.PRB　xyALGEBRA File
.PRC　Palmpilot Resource File [File Format]
　　　Picture Gear Pocket　[XnView]
.PRD　Printer Driver
.PRE　Freelance Presentation
　　　MS Programmer's WorkBench Settings
.PREFS　Preferences File (various)
.PRF　Preferences File (various)
　　　dBase IV Printer Driver
　　　Monarch Portable Report File (data mining)
　　　Profiler Output
　　　PICS Rules File
　　　Polychrome Recursive Format　[XnView]
　　　Fastgraph Pixel Run Format Grahics
.PRG　Program File (various)
　　　OzWin CompuServe E-mail/Forum Access Purged Message File
　　　WAVmaker Program
　　　Atari Program
　　　SHARP MZ-series Emulator File
　　　SpecEm Snapshot
.PRI　LocoScript Printer Definitions
　　　Prisms　[XnView]
.PRJ　Project File (various)
　　　3D Studio File
　　　HitPlayer Advanced Playlist File
　　　Monarch File (data mining)
.PRK　Tony Hawk's Pro Skater 2 Saved Park
　　　CampgroundMaster/ResortMaster Database
.PRL　Process Revolution Object Library File (Diagrams, Process Maps, Flow Charts)
.PRM　Parameter File
.PRN　Printer Text File (various)
　　　HP Printer Control Language [SwiftView]
　　　DataCAD Windows Printer File
　　　XYWrite Printer Driver
　　　PostScript File
.PRO　Guitar Chord File [On-line Guitar Archive]
　　　PROLOG Program File
　　　Creamware Pulsar Audio File
　　　Sid Meier's SimGolf
.PRP　Palace Prop File
　　　InstantDB Database File
.PRS　Printer Resource File
　　　WordPerfect Printer Resource Font File
　　　dBase Procedure
　　　Harvard File (Harvard Graphics taken over by Serif)
.PRT　Printer　Configuration (various)
　　　Printer-formatted File
　　　SCEdit Part File (Roland Sound Canvas sound modules; MIDI-related)
　　　Unigraphics Part File (CAD modeling data)
　　　CADKEY Part File
　　　Pro/ENGINEER Model File
　　　Associated with the W32/Parrot-A worm; particularly if found in the
　　　　Windows directory along with .EXE files of the same root name.
　　　Process Revolution Template File (Diagrams, Process Maps, Flow Charts)
.PRV　PsiMail Internet Provider Template
　　　Previous Version (used for files that change)
.PRX　Foxpro Compiler Program
　　　Process Revolution Diagram File (Diagrams, Process Maps, Flow Charts)
.PRZ　Freelance Graphics 97 File
.PS　 PostScript　[Ghostscript]　[XnView]
.PSB　Pinnacle Sound Bank
　　　Project Scheduler Configuration File
.PSD　Photoshop Format　[XnView] [IrfanView]
　　　Apple Viewer File
　　　DESIGN II for Windows General Flowsheet (Refining Process Simulation)
.PSE　IBM Printer Page Segment Bitmap　[XnView]
.PSF　Chiwriter PostScript Printer Font
　　　PhotoStudio Graphic　[XnView]
.PSH　Punch Home Design Series CAD Data File
.PSI　PSION A-law Audio
.PSM　Turbo Pascal Symbol Table
　　　Protracker Studio Module Format
　　　Epic Games Sound Data
　　　SolidEdge CAD File
　　　PrintShop Mail (desktop publishing)
.PSMDOC　PrintShop Mail (desktop publishing)
.PSMODEL　Delcam Powershape (3D CAD)
.PSN　Post-it?Software Notes
.PSP　PaintShop Pro Image　[XnView] [IrfanView]
　　　Project Scheduler Planning File
　　　Prodea Synergy Procedure
.PSR　Project Scheduler Resource File
.PSS　Sony Playstation Game File
　　　Axialis Screen Saver Producer File
.PST　MS Outlook Personal Folder File
　　　Ulead Pattern　[XnView]
.PSW　WinXP Backup Password File
.PSX　Dirty Little Helper Chat File
　　　X-Plorer/X-Ploder, Cheat Machine, etc. Single Game Save
.PSY　PLD2 System File
　　　Psychedelic Windows Products
.PT　 Kodak Precision Transform [Download]
　　　PassMark PerformanceTest File
.PT3　Harvard Device Driver (Harvard Graphics taken over by Serif)
　　　PageMaker Template
.PT4　PageMaker Template
.PT5　PageMaker Template
.PTB　Power Tab Guitar Tablature Editor
　　　PubTach Batch Works Script
.PTC　NRG Symphonie Patch File
.PTDB　Peachtree Accounting Database
.PTH　4D Database Windows Pathname Document
.PTI　IBM Configurator Configuration
.PTK　Red Alert 2 File
.PTM　PolyTracker Music Module
　　　MS MapPoint Map
　　　PubTech BatchWorks Macro
.PTN　PaperPort Thumbnail Images (Hidden file: PPTHUMB.PTN)
.PTP　Act! Modem Sync File
.PTR　QMail Qwk Reader Pointer
.PTS　Infinity Engine Game Tileset
　　　Halflife Map Creation Debug File
.PTT　MS MapPoint Template
.PTX　E-Transcript of Court Proceedings　[Viewer]
.PUB　PGP Public Key Ring
　　　Ventura Publisher
　　　MS Publisher Document
　　　The Sims (Maxis) Family Data
　　　Print Perfect Gold Template
.PUBHTML　MS Publisher HTML Document
.PUBMHTML　MS Publisher Archived HTML Document
.PUD　Warcraft II PUD Map　[PUD Browser] [PUD Format]
.PUF　Puffer Encrypted File (File & E-mail Encryption)
.PUT　Instalit Script
.PUZ　Across Lite Crossword Puzzle [FAQ]
　　　Packed MS Publisher File
.PVA　Hauppauge DVB-Software
.PVL　Instalit Library
.PVS　Scarlett Expert System Compiler Reserved Words File (Scarlett is not presently available)
.PVT　Local Fidonet Pointlist
.PW　 Professional Write Text File
.PWA　Password Agent File
.PWC　COSMI Street Maps and Vacation Planner
.PWD　Pocket Word Document
　　　AutoCAD Password File (ACAD.PWD)
　　　Password Pro File
.PWF　ProCite Workforms
.PWI　Notes for Windows CE
.PWL　Password List
.PWP　Photoworks Image File
　　　Professional WritePlus Document
　　　Seattle Film Works Multi-image File (Actually MGI PhotoSuite File) [Filmworks Viewer] [XnView]
.PWT　HotDog PageWiz Template
　　　MS Pocket Word Template File
　　　Autocad Publish-to-Web Template
.PWZ　PowerPoint Wizard [Buy Office XP at Shop.Microsoft]
.PX　 Primary Index
　　　Paradox Primer Database Index
.PXA　Pixia Color Painter File [Japanese]　[XnView]
　　　Pegs　[XnView]
.PXB　Pixibox　[XnView]
.PXD　eJay Mixer File
.PXE　Partial XML Envelope
.PXI　Pixie File (scalable vector images viewed with an applet)
　　　Note: The file $$d2k.pxi is associated with a Trojan
.PXL　Pocket Excel Spreadsheet
.PXN　PictureWorks PhotoEnhancer Graphic Image (Kodak format not now supported)
.PXR　Pixar Picture　[XnView]
.PXS　Pegs　[XnView]
.PY　 PYTHON Script
　　　Yahoo Saved Messages
　　　Oracle Batch Procedure
.PYC　Compiler PYTHON Script
.PZ2　Curious Labs Poser Pose File
.PZ3　Curious Labs Poser Document
.PZA　MGI PhotoSuite II/III/4 Album File
.PZC　GraphPad Prism Script
.PZD　Pizazz Plus Defaults
.PZF　GraphPad Prism Project
.PZL　Puzzle　[XnView]
　　　Lode Runner Game Puzzle
.PZM　GraphPad Prism
.PZO　Pizazz Plus Overlay
.PZP　Pizazz Plus Palette
　　　MGI PhotoSuite II/III/4 Project File　[XnView]
.PZS　Pizazz Plus Settings
　　　MGI PhotoSuite II/III/4 Slide Show File
.PZT　Pizazz Plus Transfer File
　　　GraphPad Prism Template
.PZX　Pizazz Plus Swap File
.PZZ　Curious Labs Compressed Poser File

.Q0　 Q0 Graphic　[XnView]
.Q00　Quicken 2000 File
.Q01　Quicken 2001 File
.Q1Q　LunarCell Plug-in File
.Q98　Quicken 98 File
.Q99　Quicken 99 File
.Q9Q　BladePro Graphic Plugin File
.QAB　QABUTIL File
　　　SYBYL Binary Field Files
.QAD　PF QuickArt Document
.QAG　Norton Desktop Quick Access Group
.QAP　Omnis Quartz Application File
.QAX　ExpressTracker Data File
.QB1　Quicken File
.QBA　QuickBooks File
.QBB　QuickBooks for Windows Backup File
.QBD　Keyboard Layout
.QBE　Example Query (Query By Example)
　　　dBase IV Saved Query
　　　Quattro Pro Saved Query
.QBL　Business Lawyer Document
.QBO　dBase IV Ordered Query
.QBS　MS Quick Basic Program File
.QBW　QuickBooks for Windows File
　　　Quicken File
.QCB　MS Combat Flight Simulator Quick Combat Editor File
.QCD　QuarkCopyDesk SE
　　　Cliq Accessories Phonebook Data [Linux Suite PDF Description]
.QCF　Q-emuLator (a Sinclair QL emulator)
　　　QuickLogic Constraint File
.QCH　Quicken for DOS ver 2 Data File
　　　SSI Dark Queen of Krynn File
.QCI　Massively Parallel Quantum Chemistry Program File
　　　Cliq Accessories Phonebook Index [Linux Suite PDF Description]
.QCK　Quick Charts File
　　　Quick Foram Count File
　　　VAX CRYSTALS Chemical Crystallogaphy File
　　　QuickCard File
　　　Jigsaw 2 Astrological Tool File
.QCM　3164 Emulator Quick Command File
　　　QUCM Application File (Link is PDF file) (interface CATERPILLAR CCM devices to POWERLOGIC system)
.QCP　Qualcomm PureVoice File
.QCS　CADQC Standard File
.QCT　Memory-Map File (Navigation software for digital maps)
.QD　 SHARP MZ-series Emulator File
.QD?　Omnis Quartz Data File Segment (can be 0 to 9)
.QDAT　Quicktime Installer Cache
.QDF　Quicken for Windows Data File
.QDI　Dictionary
　　　Quicken Data File
.QDK　Quarterdeck QEMM File
.QDT　QuickBooks UK Accountancy Data File
　　　Quicken Data File
　　　Question Mark Desigener Test File
　　　Quark Xpress Dictionary File
.QDV　Steve Blackstock Giffer Graphics File
　　　Random Dot Software QDV Graphic　[XnView]
.QEF　Excel Query [Buy Office XP at Shop.Microsoft]
.QEL　Quicken Electronic Library File
.QEM　Expensable Report
.QEP　IRMA Wordstation for Windows
.QEX　ExpensAble Data File
.QFI　QuickTime Image
.QFL　Family Lawyer Document (Now with Learning Company from Quicken)
.QFN　QuickTime Font File
.QFX　Quick Link Fax
.QIC　Backup Set [Note: People report trouble moving .QIC backup from Win9x to WinXP.
　　　　See the Computer Knowledge QIC page for more info.]
.QIF　Quicken Interchange Format
　　　QuickTime Image
.QIX　Quicken for DOS ver 2 Data File
.QLB　MS C Quick Library
.QLC　PostScript Help File
.QLE　QOOLE (Quake Object Oriented Level Editor)
.QLF　Family Tree Maker Genealogy File
.QLP　QuickLink Printer Driver
.QM　 Quality Motion File
.QM4　QMail Mail Door Option or Services File
.QMD　Quicken for Windows ver 5,6 Data File
.QML　Quicken for DOS ver 2 Data File
.QMR　OzWin CompuServe E-mail/Forum Access Quickscan History
.QMT　Quicken Memory List
.QN2　QuickNote File
.QNA　High ASCII Quake Name Maker
.QNC　Cliq Accessories Notepad Customization [Linux Suite PDF Description]
.QND　Cliq Accessories Notepad Data [Linux Suite PDF Description]
.QNI　Cliq Accessories Notepad Index [Linux Suite PDF Description]
.QNM　High ASCII Quake Name Maker
.QNT　Chromeleon Quantification Method
.QNX　Quicken Indexes
.QPB　Quicken Payroll File
.QPD　QP Software Dynamic Plug-in (expected web release 1 Mar 2002)
.QPR　OS/2 Printer Queue Driver
　　　Foxpro Relational Query
.QPS　QP Software Application File (expected web release 1 Mar 2002)
.QPW　Quattro Pro Project File
.QPX　Foxpro Ordered Query
.QQT　Quick Qard Technology Qardware Definition File
.QRD　BI/Query Query Result (used to be Andyne GQL)
.QRP　Centura Report Builder File
　　　Liberty for Windows Report File
　　　Dosh Software File
.QRS　WordPerfect Equation Editor
.QRT　QRT Ray Tracing Graphic　[XnView]
.QRY　dBase IV Query
　　　MS Query
　　　BI/Query Query
.QS9　OzWin CompuServe E-mail/Forum Access Scan Result File
.QSC　Pxyl Visuals Chart
.QSD　Quicken for Windows Data File
.QSL　OzWin CompuServe E-mail/Forum Access Forum Quickscan List
.QSM　QuadriSpace Model Format File (2D/3D presentations)
.QST　Quake Spy Tab File
.QT　 Quicktime Video
.QTC　Incite Media Assistant File
.QTF　Qtracker Filter (parameters used to filter music or game servers)
.QTI　QuickTime Image　[XnView]
.QTIF　QuickTime Image　[XnView]
.QTK　Apple Quicktake File (PICT variant created by Quicktake 100/150 camera. Quicktime player needs QuickTake driver to show.)
.QTL　Quicktime Movie
.QTM　QuickTime Movie
.QTMP　Qtracker Mapshot Pack (images of game levels)
.QTP　QuickTime Preferences
　　　Astra Quicktest Report
.QTPF　QuickTime PreFlight Text
.QTPP　Qtracker Program Package (Used to distribute updates)
.QTS　Macintosh PICT Image
　　　QuickTime Image
.QTSK　Qtracker Skin (PlayerWatch skin file)
.QTW　QText File (mixed English/Hebrew)
.QTX　QuickTime Image
.QUE　Task Scheduler Queue Object
　　　CuteFTP Queue File
.QUICKEN　Quicken Spreadsheet
.QVM　Quake File (UI.QVM or GAGAME.QVM in VM directory)
.QW　 Symantec Q&A Write Program File　[Support]
.QW5　Quicken 5 File
.QW6　Quicken 6 File
.QWB　MS Money Quotes WriteBack Import File
.QWK　QWK Reader Message File
.QWP　Quiptics Puzzle File
.QXB　Quark Xpress Books File
.QXD　Quark Xpress File
.QXL　Quark Xpress Element Library
.QXT　Quark Xpress Template File
.R　　Pegasus Mail Resource File
　　　Rebol Script
　　　Progress Compiled Program File
　　　Ratfor FORTRAN Preprocessor File　[FORTRAN]
.R??　RAR Compressed File (?? can be 00 to 99)
.R1A　Yamaha RM1x Dance-Music Workstation
.R2A　Yamaha RS7000 Music Production Studio Sequencer
.R2D　RISA-2D Simple Analysis & Design
.R2K　Repertoire 2000 Music Database
.R2P　Yamaha RS7000 Music Production Studio Sequencer
.R33　Train Simulator Game File
.R3A　Yamaha RS7000 Music Production Studio Sequencer
.R3D　RISA-3D 3D Analysis & Design
.R3P　Yamaha RS7000 Music Production Studio Sequencer
.R64　Top Secret Crypto File
.R8　 RAW Graphic File
　　　Flight Simulator Texture File
.R8L　LaserJet Landscape Font
.R8P　LaserJet Portrait Font
.RA　 RealMedia File　[IrfanView]
.RAD　Radiance Scene Description Format　[XnView]
.RAM　RealMedia Metafile
.RAN　Dexterpen File (Parametric 2D design and calculation)
.RAP　Rapanalyst File (Rapid Application Predictive Technology Organization Resource)
　　　Rapidocs Document
.RAR　RAR Compressed Archive
　　　Java JCA Resource Adapter Module
.RAS　Sun Raster Graphic　[XnView] [IrfanView]
　　　Cals Raster File [SwiftView]
　　　Max Payne Data File
　　　Sky Subtracted Data
.RAST　Sun Raster Graphic　[XnView]
.RAT　Rating System File
　　　Rats Data
　　　Nimbus 7 SAMS Data File (radiance data)
.RAW　RAW RGB 24-bit Graphic　[XnView]
　　　Raw Signed PCM Data
　　　Sentry 2020 Encryption File
　　　VitaGraph File (medical testing related)
　　　Nimbus 7 SAMS Data File (radiance data)
　　　HSI Raw File　[XnView]
　　　Spectrum Raw Memory Dump
　　　V41/eV41 Program Files
.RAX　Image File
.RB　 RocketEdition File
　　　Ruby Interpreter Program
.RB1　R:Base Data File
.RB2　R:Base Data File
.RB3　R:Base Data File
.RBB　Top Secret Crypto File
.RBF　R:Base Data File
　　　Oracle Backup File
　　　MS Rollback File (backup of existing file stored in hidden config.msi directory)
.RBH　RoboHelp Configuration
.RBM　Propellerhead ReBirth Modulation v2.0
　　　Rail Baron Player Map
.RBN　Richard's Bridge Notation
　　　Real Sound File
.RBO　Sometimes associated with the Magistr.B Worm [Worm Info]
.RBPM　POrtable Bitmap　[XnView]
.RBS　Propellerhead Software ReBirth Song
　　　Rutherford Backscattering Spectroscopy Analysis Package (RUMP)
　　　MS Rollback Script (see .RBF)
.RBX　XStream Multimedia Simulation Format
.RBZ　Rail Baron Player Saved Game
.RC　 Borland C++ Resource Compiler Script File
　　　Emacs Configuration
.RC2　ReCycle v.2 Audio Loop
.RCD　PC Anywhere Recorded Session File
.RCG　Netscape Newsgroup File
.RCH　SWAT Reach Output File (river basin scale model)
.RCM　Logos Library System 2.x Verse Map
.RCP　Recomposer's MIDI Sequencer Music File
.RCS　Colin McRae Rally Save Game File (unverified)
.RCX　Lego Mindstorms Robotics Invention System
.RCY　ReCycled Audio Loop
.RD1　Descent1 Registered Level File
　　　DATAIR Retirement Document System Data File
.RD2　DATAIR Retirement Document System Custom Text File
.RD3　Ray Dream Designer Graphics
　　　CorelDream 3D
.RD4　Ray Dream Designer Graphics
.RD5　Ray Dream Designer Graphics
.RDA　Oracle Storage Area File
.RDB　TrueVector Rules Database
　　　ZoneAlarm Rules Database　(IAMDB.RDB file)
　　　Gear CD Suite File
　　　Oracle Database Root File
.RDF　Resource Description Framework File
　　　Geoworks UI Compiler Source Code
　　　Chromeleon Report Definition
　　　Workshare Synergy Collaboration Response File
　　　Burli Newsroom System File
　　　Oracle Report Binary Source
　　　Rate Description File (BLDRATE.EXE output)
.RDI　Device-independent Bitmap
.RDL　Descent Registered Level
　　　RadioDestiny Radio Stream
　　　Symbian Recogniser Library (allows OS to recognize document formats)
.RDP　Remote Desktop Connection
.RDS　Ray Dream Studio File
.RDT　RDT Tracking File (capture design process and manage the system requirements)
.RDX　Reflex Data File
.REC　Sprint Record File
　　　EpiInfo Data
　　　Windows Recorder Macro
　　　RapidComm Voice File
.RED　Calrion Modula-2 Path Data
.REF　Cross Reference
.REG　Registration Data (various)
.REGET　ReGet Deluxe Downloader
.REM　Annotation (remark)
.REP　Text Document
　　　Report File (various)
　　　Blizzard Entertainment Replay File
　　　Qwk Reader Reply
.REQ　Request
.RES　Resource File (various programs)
　　　Championship Bass Archive　[Dragon UnPACKer]
　　　Evil Islands Archive　[Dragon UnPACKer]
　　　Half Life Game Map [Maps] [Viewers]
.RESX　MS .NET XML Resource Template
.REV　Geoworks Revision File
　　　Workshare Synergy File
　　　WinRAR Recovery Volume File
.REX　REXX Program File
　　　Oracle Report Definition
　　　ReCycled Audio Loop Export File
　　　4D Database Windows Client Local File
.REZ　Resource File
　　　Aliens and Predator 2 Game File
　　　Blood 2 Archive　[Dragon UnPACKer]
　　　No One Lives for Ever Archive　[Dragon UnPACKer]
　　　Sanity: Aiken's Artifact Archive　[Dragon UnPACKer]
　　　Shogo Archive　[Dragon UnPACKer]
.RF　 Sun Raster Graphic
　　　RealFlash Clip
.RF?　SmartWare Compiled Project File (requires login)
.RFB　RoboForm
.RFD　RecogniFORM Form Definition
　　　Emperor: Battle for Dune Archive　[Dragon UnPACKer]
.RFF　Maggi Graphic File
.RFG　RFG Integrator System Database
.RFH　RFG Integrator Householding Database
　　　Maxagrid CTM Refresh File (text format)
.RFL　RISAFloor Analysis & Design
　　　Reason Sound File
　　　Guardian Database Roll-forward File
.RFP　AI RoboForm Passcard Database
.RFT　IBM DisplayWrite Revisable Format Text
　　　AI RoboForm Form Database
.RGB　Q0 Graphic　[XnView]
　　　Silicon Graphics RGB　[XnView]
.RGBA　Silicon Graphics RGB　[XnView]
.RGI　RealArcade Game Installer (not secured)
.RGL　Scarlett Expert System Compiler Rules File (Scarlett is not presently available)
.RGN　Championship Manager Game File
.RGP　RealArcade Game Package
.RGS　RealArcade Game Installer (secured)
.RGX　ReaGeniX Code Generator Symbol Table
.RH　 Borland C++ Resource Header File
.RI　 Lotus File
.RIA　Alpharel Group IV Raster Graphics File
.RIB　3D Reality Renderman Format Graphics
.RIC　Ricoh FAX Graphic File
.RIF　Fractal Painter Bitmap
.RIN　RappInfo PostScript Converter Configuration File
.RIP　Remote Imaging Protocol
.RIX　ColorRIX VGA Paint File　[XnView]
　　　RIX Virtual Screen
.RL　 The 7th Guest Archive　[Dragon UnPACKer]
.RL1　Descent1 Registered Level File
.RL2　Descent2 Registered Level
.RL4　Bitmap Graphics
.RL8　Bitmap Graphics
.RLA　Advanced Visualizer File
　　　Wavefront Raster Image
.RLB　Harvard Graphic File (Harvard Graphics taken over by Serif)
.RLC　Image Systems CAD Overlay (RLC2 Graphic)　[XnView]
　　　Scanner One-bit/pixel Grahpic Output
.RLE　Graphic (Run Length Encoded)　[XnView] [IrfanView]
　　　Utah Raster Image　[XnView]
.RLZ　Realizer Source Code
.RM　 RealMedia File
.RMD　RegMaid Document
.RMF　Rich Map Format (3D Games)
　　　Acrobat File
.RMI　MIDI File　[IrfanView]
.RMJ　Real Jukebox File
.RMK　Clipper RMake Make File
.RML　Redline Markup Language File (XML-based exchange of design markup and redline information)
.RMM　RealPlayer File
.RMR　Resume Maker File
.RMS　AutoCAD Data File for Boss RMS (River Modelling System)
　　　Secure RealMedia File
.RMX　RealJukeBox MP3 File
.RN　 Nota Bene XPL Program
.RND　AutoCAD Rendering Slide
　　　AutoShade Format
.RNG　Nokia Ringtone File
　　　Top Secret Crypto File
.RNL　GTX Runlength Raster Graphics
.RNO　VAX Runoff File
.RNX　RealPlayer File
.ROI　Actuate ReportBlast File
.ROL　Adlib Music File
.ROM　Nintento 64® Emulation ROM Image
　　　(actually most any emulator or BIOS flasher)
　　　MZ700 Emulator (MZ700.ROM)
.ROQ　Medal of Honor - Allied Assualt
.ROV　Rescue Rover Data
.ROX　Actuate ReportBlast File
.RP　 RealPix Clip
　　　Rainbow Painter　[XnView]
.RP?　RescuePro Physician Invoice File (? can be 0-9)
.RPB　Automotive Diagnostic File
.RPBM　Portable Image　[XnView]
.RPC　Rich Photorealistic Content (ArchVision, Inc.)　[Info]
.RPD　Rapidfile Database
　　　RPV Printing System File
.RPGM　Portable Greyscale　[XnView]
.RPIN　Adobe InDesign Import/Export Filter
.RPJ　Relex (Reliability Analysis Software)
.RPK　Rippack File
.RPL　Replica Text File
.RPM　RedHat Package Manager (Linux Library)
　　　RealMedia Player File
　　　RunPaint Multicolor Graphic　[XnView]
.RPNM　Portable Image　[XnView]
.RPPM　Portable Image　[XnView]
.RPS　Propellerhead Software Reason Song
.RPT　Report (various)
.RPV　Real Player Visualization File (animated effects to beat of music)
　　　RPV Printing System File
　　　Rebel Poker Player File (Note: Strip poker with nude graphics)
.RPW　RPWiz Project (slide show development)
.RPY　Star Wars - Tie Fighter Media
　　　Grand Prix Legends Racing Simulation Game File
.RQY　MS Excel OLE DB Query File [Buy Office XP at Shop.Microsoft]
.RR　 Railroad Tycoon
.RRD　ERDAS Imagine File (remote sensing)
.RRS　Road Rash Save File
.RS　 Amiga Reassembler Resource Data File
　　　EROSION 3D Event File [Format (pdf)]
　　　Sun Raster Graphic　[XnView]
.RS_　Macintosh File Resource Fork
.RSB　Rogue Spear Bitmap
　　　Red Storm Image Format　[XnView]
.RSC　Resource File
　　　SymbianOS Application Resource File (application resources)
.RSF　Mediafour MacDrive Macintosh Resource Fork
.RSL　PC Tools Resources Library
　　　Borland's Paradox 7 Report
　　　Adobe Pagemaker File
.RSM　RuneSword II Game
　　　Resume (often an MS Word file)
　　　WinWay Deluxe Resume File
.RSML　Real Player File
.RSN　Propellerhead Reason Audio File
.RSP　Responce Text File
　　　MS ODBC Driver Configuration File (Installation direcives used setting up MS Universal Data Access services)
　　　Rockwell Software Logix 5 File
　　　Workshare Synergy Response File
　　　MDaemon File
.RSR　4D Database Resource Fork File (.4D? for data fork)
.RSS　Rockwell Logix 500 SLC-5 Software
.RST　ANSYS Results
.RT　 Real Media File
.RTA　RoboHelp Configuration
.RTF　Rich Text Format File (also used as Windows Help file script)
.RTH　ANSYS Results
.RTK　RoboHelp Configuration
.RTL　Text File
　　　NU 7.0 Runtime Library
.RTM　Real Tracker Music Module
.RTP　TurboTax Update File
　　　RTPatch Update Package
　　　Gerber Sign-making Software File
.RTS　RoboHelp Configuration
　　　RealAudio RTSL Document
　　　Realizer Runtime Library
.RTX　Reliacast Audience Manager Turnstile
　　　Mobile Phone Ringtone (extended ringtone format)
.RUJ　Oracle Recovery-Unit Journal
.RUL　InstallShield
.RUN　PC Tools Script Tools Program
.RV　 RealVideo Clip
.RVG　Revit External Group File
.RVI　Revenant Archive　[Dragon UnPACKer]
.RVM　Revenant Archive　[Dragon UnPACKer]
.RVN　Riven Saved Game
.RVP　Microsoft Scan Configuration File
　　　C|Net CatchUp File Mime Type: application/x-mss-scancfg
.RVS　Revenant Archive　[Dragon UnPACKer]
.RVT　Apache Rivet Tcl File
　　　IEX Workforce Management Report (text file)
　　　Incite Media Assistant File
　　　Revit Design Setup File
　　　VersaPro Reference View Table
.RVW　Review (may just be text file)
.RWD　Symphonie Raw Wind Data
.RWG　Random Word Generator
.RWP　IBM Configurator Report (if you don't have the program ask the sender to export to .RTF for you)
.RWS　Borland C++ Resource Workshop Data File
.RWX　RenderWare Script
.RWZ　MS Outlook Rules Wizard File
.RX　 Reflex Database Driver
　　　EARS Component File (EARS = UK Liberal Democrats Election Agents Record System) [Filename starts with E]
.RXC　WRQ Reflection X Connection
.RXD　Reflex Database
.RXF　Recipe Exchange Format (Resort Software format for chef/food & beverage manager data exchange)
.RXH　Reflex Database Help File
.RXN　MDL RxnFile (MIME type chemical/x-mdl-rxnfile)
.RXR　Reflex Database Report
.RXS　Reflex Database Screen Driver