File Extentions

.A UNIX Library [UNIX]ADA Program .A01 ARJ Multi-volume Compressed Archive (can be 01 to 99) .A11 Graphic .A3K Yamaha A3000 Sampler File .A3L Authorware 3.x Library .A3M Unpackaged Authorware MacIntosh File .A3W Unpackaged Authorware Windows File .A4L Authorware 4.x Library .A4M Unpackaged Authorware MacIntosh File .A4P Authorware File Without Runtime .A4W Unpackaged Authorware Windows File .A5L Authorware 5.x Library .A5W Unpackaged Authorware Windows File .A86 A86 Assembler Program File .A_T A-Train .AA Audio Book File .AAM Authorware Shocked File .AAS Authorware Shocked Packet .AB Applix Builder File .AB6 AB Stat Data .AB8 AB Stat Data .AB$ AutoCAD Spooled Plot File .ABC Flowchart .ABD AmBiz Bonus Calculator Data File .ABF Adobe Binary Screen Font .ABK Corel Draw AutoBackup Any Automatic Backup .ABM HitPlayer Audio Album File 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 .ABW AbiWord Document File .AC3 AC3 Audio File Format [DVD Maestro, DVD Conductor] .ACA MS Agent Character File Project Manager Workbench File .ACB ACBM Graphic Image Archived Data File .ACC DR-DOS Viewmax File .ACD Chromeleon Channel Raw Data Sonic Foundry Acid Music File MS Agent Character Definiton File .ACE The Ace Archiver Compressed File .ACF MS Agent Character File Photoshop Custom Filter .ACG MS Agent Preview File .ACH Rockwell Software Logix 5 File .ACI ACI Development Appraisal .ACL Corel Draw 6 Keyboard Accelerator .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 File Used by Adobe Acrobat Paper Capture .ACR American College of Radiology File .ACS MS Agent Character File .ACT MS Office Actor Program File FoxPro Documenting Wizard Action Diagram Photoshop Color Table .ACV OS/2 Audio Drivers Photoshop Saved Curve Also see .AD AfterDark Screen Saver .AD2 2-bit Compressed Voice File .AD3 3-bit Compressed Voice File .ADA ADA Program File .ADB ADA Package Body HP Organizer Appointment Database .ADC Chromeleon Demo Data File Scanstudio 16-color Bitmap Graphic File Lingvo Dictionary Text File .ADD OS/2 Adapter Device Driver Adobe Pagemaker File .ADE MS Access Project Extension ADC Audio File .ADF Adapter Description File Admin Config File Amiga Disk File (Uncompressed 901120 byte DD Diskimage) .ADI AutoCAD Plotter File .ADL QEMM MCA Adapter Description Library [MCA] .ADM After Dark Screen Saver Module Windows NT Policy Template Addict Compiled Dictionary .ADN 1-2-3 Add In Utility MS Access Blank Project Template .ADO Photoshop Duotone Options .ADP FaxWorks Modem Setup File Astound Dynamite File MS Access Project AOLserver Dynamic Page File [AOL] .ADR After Dark Random Screen Saver Module Smart Address Address Book .ADS ADA Package Specification .ADT HP NewWave Card Application Data File Lingvo Dictionary File AdTech Fax File .ADV GUS Virtual Device Driver .ADX Lotus Approach Index File Archetype Designer Document Dynazip Active Delivery Script .ADZ GZ-Packed Amiga Disk File (see ADF) .AE SoftQuad Author/Editor File .AEH iPer Advanced Embedded Hypertext .AEP ArcExplorer Project File .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 .AFI Truevision Bitmap Graphic .AFL Lotus Font .AFM Outline Font Metric HP NewWave Cardfile Application .AFP Flowchart Symbol Palette .AFS Filter Factory Photoshop Filter [Added] .AFT Flowchart Template .AFW Flowchart Work Area .AG Applix Graphic .AG4 Access G4 File .AGP Aspen Graphics Pages .AGW Aspen Graphics Windows .AHS Photoshop Halftone Screens .AI Adobe Illustrator Vector Graphic Corel Trace Drawing Progress Database After Image File .AIF Knowledgeware Setup Information Audio Interchange File [Viewer] .AIM AOL Instant Messenger File [AOL] .AIML Artificial Intelligence Markup Language .AIN AIN Compressed Archive .AIO APL File Transfer Format .AIP Audiosoft Parameter File .AIR Align It! Resource File .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 .ALB JASC Image Commander Album Steinberg Cubase or VST Backup Song File .ALC Norton Internet Security Ad Server File .ALI SAP Proprietary Format Document File .ALL Arts & Letters Symbols and Characters WordPerfect Printer Info Steinberg Cubase or VST Song File .ALS Alias Image .ALT WordPerfect Menu File .ALV Photoshop Levels .AM Applix SHELF Macro .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 .AMP Photoshop Arbitrary Map Settings .AMS Extreme's Tracker Module Format Photoshop Monitor Setup Velvet Studio Module .AN Groundworks Text File .ANC Canon Computer Pattern Maker File .ANI Animated Cursor [Viewer] .ANL Project Analyzer Saved Analysis .ANM DeluxPaint Animation .ANN Help Annotation .ANS ANSI Graphic [ANSI] MS Word Text and Layout .ANT SimAnt for Windows Saved Game File .AOF Acorn Object Format (used for data storage) .AOS Nokia Add-on Software .AOT ZenWorks Application Binary Object Template File .AP Applix Presents File WHAP-Compressed Amiga Archive .APA AlfaPad Organizer File .APC Lotus Printer Driver Characters Centura Team Developer Compiled Application File .APD Lotus Printer Driver Centura Team Developer Dynamic Application Library File .APF Lotus Printer Driver Fonts Acrobat Profile File Homesite Project File .API Lotus Printer Driver Info Photoshop Ink Colors Setup Application Program Interface .APK GameSpy Arcade Service .APL Centura Team Developer Application Library File APL Workspace File .APP R:Base, Symphony, DR-DOS, FoxPro (or other) Application Centura Team Developer Normal Mode Application File .APR Lotus Approach 97 File ArcView Project File Employee Appraiser Performance Review File .APS MS Visual C++ File Advanced Patching Systems with Error Checking .APT Centura Team Developer Text Mode Application File Lotus Approach Data View File .APX Lotus Approach Paradox-specific Information File Borland C++ Appexpert Database .AQ Applix Data .ARC Archive File Compressed File .ARF Automatic Response File .ARI Aristotle Audio File Compressed Archive .ARJ Compressed Archive .ARK Compressed Archive .ARL AOL Organizer File [AOL] .ARM Armadillo Software Protection System .ARR Atari Cubase Arrangement .ART Clip Art File Xara Studio Drawing Canon Crayola Art File Another Ray Tracer Format AOL Johnson-Grace Compressed File [AOL] First Publisher Raster Graphic .ARV Arsiv File .ARX Compressed Archive .AS Applix Spreadsheet .ASA MS Visual InterDev File Active Server Document .ASC ASCII Text File [ASCII] PGP Armored Encrypted File [PGP] .ASD MS Word Automatic Backup Lotus Screen Driver MS Advanced Streaming Format Description File .ASE Velvet Studio Sample .ASF MS Active Streaming (Media) File 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) .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 .ASPI Audio Catalyst .ASPX ASP.NET Source File .ASR Ms Automap Route Photoshop Scratch Area .AST Astound Multimedia File Photoshop Separation Tables Claris Works Assistant File .ASV DataCAD Autosave File Photoshop Selective Color .ASX MS Windows Media Active Stream Redirector File Cheyenne Backup Script Video File .AT2 Aldus Persuasion 2.0 Auto Template .ATF Photoshop Transfer Function .ATM Adobe Type Manager Data File .ATR Lightscape Material Library .ATT AT&T Group 4 Bitmap (fax) .ATW AnyTime Deluxe PIM File [PIM] .AU Music File (various) [Viewer] .AUD Audio File used by Westwood Studios for various games .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 Microsoft Chat Character File .AVD Avery Label Pro Data File .AVI Audio Video Interleave File [Viewer] .AVR Audio Visual Research Sound File .AVS Animation File Application Visualization System Format Stardent AVS-X Image Winamp Advanced Visualization Studio File .AVX ArcView File .AW HP AdvanceWrite Text File Applix Word File .AWB Lavasoft Ad-aware Backup File .AWD Faxviewer Document .AWK AWK Script .AWM Animation Works Movie .AWR Telsis Digital Audio File .AWS StatGraphics Data File .AX DirectShow Filter .AXD Avery Label Pro Re-Index File .AXG MS Autoroute Trip File .AXL ArcIMS XML Project File [XML] .AXR Telsis Digital Audio File .AXS MindAvenue AXEL Stream File .AXT ASCII Application Object Template Photoshop Replace Color/Color Range

  .B    Limbo Implementation File (Inferno OS)
        Applause Batch List
  .B1J  BookJones
  .B1N  1st Reader Binary Screen Image
  .B1S  BookSmith
  .B30  Ventura Publisher Printer Font
  .B3D  3D Builder File
  .B4   Helix Nuts and Bolts File (Helix Software now part of McAfee)
  .B64  Base 64 MIME-encoded File  [MIME]
  .B8   Piclab Raw Graphic File




  .BAC  Backup
  .BAD  Rime Mailer Address File
        Oracle BAD File
  .BAK  Backup
  .BAL  Ballade Music Score
  .BAR  dBase Application Generator Horizontal Menu Object
  .BAS  BASIC Language Source
        Basic Module
  .BAT  Batch Processing
  .BB   Papyrus Database Backup
  .BB2  XBBS-OS/2, XGROUP, AV and ZTree Archiver Control File
  .BBL  TeX/BibTeX Bibliographic Reference File
  .BBM  Deluxe Paint Image File
  .BBS  Bulletin Board Sytem Text
  .BCF  ConfigSafe Snapshot Index
  .BCH  dBase Application Generator Batch Process Object
        Phoenix Software (Datalex) Entry Point 90 Data File
  .BCK  Backup
  .BCM  MS Works Communications File
  .BCO  Bitstream Fontware File
  .BCP  Borland C++ Makefile
  .BCW  Borland C++ 4.5 Environment Settings
  .BDB  MS Works Dababase File
  .BDF  West Point Bridge Designer File
  .BDF  Egret Data File
  .BDR  MS Publisher Border
  .BEZ  Bitstream Fontware File
  .BF2  Bradford 2 Font
  .BFA  Blowfish-encrypted File (Extension added to original) [Program List]
  .BFC  Briefcase File
  .BFF  AIX® Backup File Format
  .BFM  UNIX Font Metrics File
  .BFX  BitFax Document
  .BG   MS Backgammon for Windows Game
  .BGA  OS/2 Graphic Array
  .BGB  MS Chat Background Graphic
  .BGI  Borland Graphic Interface
  .BGL  Flight Simulator Scenery File
  .BHF  pcAnywhere Host File
  .BI   Binary File
        Progress Database Before Image File
  .BIB  Bibliography
        TeX/BibTeX Literature Database
  .BIF  GroupWise Initialization File
        Image Capture Board Binary Black & White Image
  .BIG  Chinese (old version)
  .BIK  BioCharter Profile Backup File
  .BIN  Binary File
  .BIO  BioCharter Profile File
        OS/2 Bios File
  .BIT  Bitmap Image  

  .BIZ  Broderbund Print Shop Business Card File
  .BK   Backup
        LinguAssist File
        JetFax Faxbook File
  .BK!  Backup
  .BK$  Backup
  .BK1  Backup (Can be 1 to 9, usually with WordPerfect)
  .BKI  Backup Index
  .BKP  Backup  

  .BKS  Bookshelf Backup
        IBM BookManager Read Bookshelf
        MS Works Spreadsheet Backup
  .BKW  FontEdit Fontset Mirror Image
  .BLB  DreamWorks Resource Archive 

  .BLD  BASIC Bload Graphics
  .BLK  WordPerfect Temp File
        Lightscape Block Library
        Alias Wavefront Image
  .BLL  An extension used by the VBS/European-A worm.

     software!
  .BLT  Wordperfect for DOS File
        Saved AIM Buddy List File
  .BM   Graphic (bitmap)
  .BM1  Apogee BioMenace Data File
  .BMF  Image File  

  .BMI  Buzz Instrument
  .BMK  Help Bookmark
  .BMP  Windows OS/2 Bitmap Graphics  [Viewer]
  .BMS  Backup Magic Backup Set
  .BMW  Buzz Music File with Waves
  .BMX  Buzz Music File
  .BN   AdLib Instrument Bank
  .BNK  Adlib Instrument Bank
        SimCity Game File
        (reported to be) Bink Compressed Video/Audio File
  .BOL  MS Booasm Compressed Archive Library
  .BOM  Orcad Schematic Capture Bill of Materials File
  .BOO  Image File
        Book
        Compressed Archive File  

  .BOX  Notes Mailbox
  .BPC  Business Plan Toolkit Chart
  .BPL  Delphi Library
  .BPS  MS Works Document
  .BPT  Bitmap Master File
  .BPX  Truevision Targa Bitmap
  .BQY  BrioQuery File
  .BR   Bridge Script
  .BR3  Bryce 3D Scene File
  .BRC  Bryce 2 Scene File
  .BRD  EAGLE Board File
  .BRI  Basic Rate Interface File
  .BRK  Brooktrout Fax-Mail File
  .BRO  Tree Professional Broadleaf Creator File
  .BRP  Tree Professional Broadleaf Creator Image
  .BRW  Application file associated with financial institution(s) loan applications
  .BRX  Multimedia Browsing Index
  .BRZ  DbBRZ File (Backup or Restore)
  .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
  .BSC  Apple II Compressed Archive
        Fortran Pwbrmake Object
        Boyan Script
        MS Developer Studio Browser File
  .BSK  Bryce 4 File
  .BSP  Quake Map
        Half-life/TFC/CS Map
  .BSV  BASIC Bsave Graphics
  .BTM  4DOS Batch To Memory Batch File
  .BTN  ButtonWare File
  .BTR  Btrieve Database File
        MS Frontpage-related File
  .BUD  Quicken Backup
  .BUG  Bug (Problem) File
  .BUN  CakeWalk Audio Bundle File
  .BUP  Backup
  .BUT  Buttons! Button Definition
  .BUY  Movie Data File
  .BV1  WordPerfect Overflow File (Can be 1 to 9)
  .BVS  BVS Solitaire Collection
  .BW   SGI Black and White Image
        Silicon Graphics Raw RGB File
  .BWB  Visual Baler Spreadsheet File
  .BWI  Blindread/Blindwrite
  .BWR  Kermit Beware Bug List
  .BWS  Blindread/Blindwrite
  .BWT  Blindread/Blindwrite
  .BWV  Business Wave File
  .BYU  Movie File
  .BZ   Bzip UNIX Compressed File
  .BZ2  Bzip UNIX Compressed File (Replaces .BZ)

.C C Program File Check Point Site Configuration for Secure Remote .C?? Winace Compressed File .C00 Ventura Print File .C01 Typhoon Wave File .C2D IsoBuster File .C4D Cinema 4D (3D Modeling texturing and animation program) .C86 C86 C Program .C-- Sphinx C-- Source code .CA Telnet Server Initial Cache Data File DATAIR FlexPlus Data File .CA7 Beta 44 Job File .CAB Cabinet File (Microsoft installation archive) .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 Cals Raster File [SwiftView] .CAM Casio Camera Graphic [Viewer] .CAN Navigator Fax .CAP Ventura Caption Network Associates Sniffer Capture File Telix Session Capture Compressed Music File .CAR AtHome Assistant File .CAS Comma-delimited ASCII File .CAT dBase Catalog Quicken IntelliCharge Categorization File .CB MS Clean Boot File .CBC CubiCalc Fuzzy Logic System File .CBI IBM Mainframe Column Binary Formatted File .CBL COBOL Program .CBM XLib Compiled Bitmap .CBT Computer Based Training .CC C++ Program File Visual dBASE Custom Class File .CCA CC:Mail File .CCB Visual Basic Animated Button Configuration .CCC Chat Curtain Call Native Bitmap Graphic .CCD CloneCd Related File .CCE Calendar Creator Plus Data File .CCF OS/2 Multimedia Viewer Configuration File Symphony Communications Configuration File .CCH Corel Chart .CCL Intalk Communication Command Language .CCM Lotus CC:Mail Mailbox .CCN Vitalize! Game File [Played via IE plug-in] .CCO CyberChat Data File .CCR Chat Room Shortcut .CCS CONKY CeZaR Stribas International .CCT Macromedia Director Shockwave Cast .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 PowerDesigner Conceptual Model Backup File .CDC Chromeleon Driver Configuration Plugin .CDD Chromeleon Device Driver .CDF Comma Delimited Format Cyberspace Description Format MS Channel Definition Format InstallShield Components Definition File NetCDF Graphic File .CDI Phillips Compact Disk Interactive Format .CDK Atari Calamus Document .CDM PowerDesigner Conceptual Model File Visual dBASE Custom Data Module .CDR Corel Vector Graphic Raw Audio-CD Data .CDT Corel Draw Template .CDX Compound Index Corel Draw Compressed Drawing MS Visual Foxpro Index Active Server Document Microstation Cell Library Index .CDZ ROM With a View Project File .CE FarSide Computer Calendar File .CEG Continuous Edge Graphic Tempra Show Bitmap Graphic .CEL Autodesk Animator Graphic CIMFast Event Language File Kiss Paper Doll File Microstation Cell Library .CER Certificate File .CEX The Currency Exchanger Rate File INMOS Transputer Development System Occam User Program .CF Imake Configurtion File .CFB Comptons Multimedia 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 .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 .CHD FontChameleon Font Descriptor .CHF pcAnywhere Remote Control File .CHI Chiwriter Document .CHJ Help Composer Project .CHK CHKDSK/SCANDISK Output WordPerfect Temp File .CHL Chromeleon Channel Raw Data Configuration History Log .CHM Compiled HTML Help .CHN Ethnograph Data File .CHP Ventura Publisher Chapter .CHR Character or Font File .CHT Cheat Machine Data File ChartViewer dBase Interface File Harvard Graphics Vector File (Harvard Graphics taken over by Serif) .CIF Ventura Chapter Information CalTech Intermediate Graphic Easy CD Creator Image pcAnywhere Caller File Ventura Converted Image File Colombo Ipermedia File .CIL Clip Gallery Download Package .CIM Sim City 200 File CIMEX Cimpack Design Drawing File .CIN OS/2 Change Control File .CIR SuperMax E-CAD Save-File Command .CIT Intergraph Scanned Image .CIX TCU Turbo C Utilities Database Index .CK1 iD/Apogee Commander Keen 1 Data File (.CK1 to .CK6) .CKB Borland C++ Keyboard Mapping File .CKP Ingres Checkpoint File .CL Generic LISP Source Code .CL3 Easy CD Creator Layout File .CL4 Easy CD Creator Layout File .CLA Java Class File (usually .CLASS but can be shortened) .CLF ListPro File .CLG Disk Catalog Database .CLK Corel R.A.V.E. Animation File .CLL Crick Software Clicker File .CLO Cloe Image .CLP Windows Clipboard/Picture [Viewer] Quattro Pro Clip Art Clipper 5 Compiler Script .CLR WinEdit Colorization Word List 1st Reader Binary Color Screen Image PhotStyler Color Defintion .CLS Visual Basic Class Module C++ Class Definition .CLW Microsoft Visual C++ Class Wizard File .CM Craftman Data File .CM4 ClipMate Data File .CMA Applix TM1 Database File (text) .CMB Chromeleon Backup Archive .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 .CMP Leadview Bitmap Open Access File Address Document JPEG Bitmap CorelDRAW Postscript Printer Header Route 66 Address Document MS Word for DOS User Dictionary .CMR MediaPlayer Movie .CMU Carnegie Mellon Univeristy Stereo Raster Image .CMV Corel Move Animation .CMX Corel PhotoPaint Image Corel Presentation Exchange Image Apple Viewer File .CNC CNC General Program Data .CND ControlDraw File .CNF Configuration (various) SpeedDial .CNM Windows Application Menu Options and Setup File .CNQ Compuworks Design Shop 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 .COB COBOL Program File Caligari Truespace Format TrueSpace2 Object .COD Code List Compiler Program Code .COD Multiplan Data File dBase Template Source File FORTRAN Compiled Code Video Text File .COL Autodesk Color Palette Multiplan Spreadsheet Lotus Notes Import Column Description File .COM Command (Executable file) .CON Knowledgeware Consolidation File Tree Professional Conifer Creator File Simdir Configuration File .CONF IRC Related Configuration File (IRCDs or EggDrops) .COP Tree Professional Conifer Creator Image File .COV Fax Cover Page (Win2000 Cover Page Editor) .CP8 CP8 256 Gray Scale Image .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 .CPJ CeQuadrant CD Project .CPL Control Panel Extension Corel Color Palette Compel Presentation .CPO Corel Print House File .CPP C++ Program CA-Cricket Presents Presentation .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 .CPT Macintosh Compressed File Corel Photo-Paint Image [Viewer] dBase Encrypted Memo CA Cricket Presents Template .CPX Control Panel Applet CryptaPix Encrypted Image Corel Presentation Exchange Compressed Drawing .CPY Copy Books Data File .CPZ COMPOZ Music Text .CRD Cardfile (Windows 3.x Database) .CRF Zortech C++ Cross-Reference File .CRH MS Golf Image File Links Games Course File .CRL Certificate Revocation List .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 .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) (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 .CSC Corel Script .CSD Bitstream Fontware File Chemsoft® MSDS Database File .CSF Van Dyke's CRT/SecureCRT Script 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 .CSP PC Emcee On-Screen Image .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 Bitmap .CTC PC Installer Control .CTF TIFF Compressed File Symphony Character Code Translation .CTL Setup Information (various) User Control (various) .CTT Hotmail List of E-mail Contacts .CTX Compressed Text Visual Basic User Control Binary File Pretty Good Privacy (PGP) Ciphertext File MS Online Course Text .CTY SimCity City File .CUE MS Cue Cards Data Description File for a CD-Image [Fireburner.com or Goldenhawk.com] .CUF Turbo C Utilities Form Definition .CUL IconForge/ImageForge Cursor Library .CUR Cursor [Viewer] .CUT Dr. Halo Bitmap Graphic INMOS Transputer Development System Occam Utility Package .CV Corel Versions Archive MS CodeView Information .CV4 Codeview Colors .CVG Image File .CVP WinFax Cover Page .CVS Canvas Drawing File .CVT dBase Converted Database .CVW Codeview Colors .CWE Crossword Express .CWK Claris Works Data also see AppleWorks .CWS Claris Works Template also see AppleWorks .CXE Common XML Envelope .CXT Macromedia Director Protected Cast File .CXX Zortech C++ Program .CYN Cynex Root55 Program Extension .CYP Cypherus Encrypted Archive

.D Dialect Source Code File .D2D 3D Fassade Plus 2D/3D Object File .D3D CorelDream 3D File .D64 Commodore 64 Emulator Disk Image .D8A AmBiz Productivity Pak Catalog .DAD Chromeleon Channel Raw Data .DAO Windows Registry Backup IsoBuster File .DAP Omnis5 Application File MS Access Data Access Page .DAT Data (multiple programs) WordPerfect Merge Data (also possibly) MPEG File Mitsubishi DJ-1000 and Photorun Native Format .DB Paradox Database Progress Database Solid Database WindowsXP Thumbnail Database ANSYS Database .DB2 dBase II File .DBB ANSYS Database Backup .DBC MS Visual Foxpro Database Container .DBF Database (multiple programs) [started as dBASE] Oracle 8.x Tablespace File .DBK dBase Database Backup Orcad Schematic Capture Backup File .DBM Cold Fusion Template .DBO dBase IV Compiled Program File .DBQ Paradox Memo .DBT Database Text File [dBASE] .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 .DC5 DataCAD Drawing File .DCA Visual Basic Active Designer Cache IBM DisplayWrite Document Content Architecture Text File .DCB Concordance Database Control Block .DCD Document Content Description File FORTRAN Data File INMOS Transputer Development System Occam Object Code .DCF Design Rule for Camera File Systems File DynSite Configuration File Dyadic Data File .DCL DumpSec .DCM DCM Module Format .DCP Delphi Compiled Packages OS/2 Data CodePage .DCR Shockwave File .DCS Quark Desktop Color Separation Specification ACT! Activity Data File .DCT Dictionary (various) MS Visual Foxpro Database Container .DCU Delphi Compiled Unit .DCX FAX Image [Viewer] PC-Paintbrush File [SwiftView] Bitmap Graphics [Viewer] Macros MS Visual Foxpro Database Container .DD Macintosh Compressed Disk Doubler Archive .DDB Bitmap Graphics File INMOS Transputer Development System Occam Debugging Info .DDE Dynamic Data Exchange .DDF BTRIEVE Database Bitstream Fontware File .DDI DiskDupe Image Disk Doubler Image .DDP OS/2 Device Driver Profile File .DDS INMOS Transputer Development System Occam Compiler Descriptor .DEB DOS Debug Script Debian Linux Package .DEF Definitions Defaults SGML Tag Definition 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 .DEP Setup Wizard Dependency .DER Certificate File .DES Description Text .DEV Device Driver Device Independent TeX LaTeX File .DEZ DES Encrypted Zip File .DF Lightscape Parameters .DF1 Omnis7 and Omnis Studio Database File (also .DF2, .DF3, etc.) .DFD File Flow Diagram Graphic .DFI Digifont Outline Font Description .DFL Signature Default Program Settings .DFM Delphi Forms File Flow Diagram Model .DFS Delight Sound File .DFV Word Print Format Template .DG Autotrol Graphics .DGC TurboTax-related File .DGN Microstation95 CAD Drawing File Intergraph Graphics .DGO Dimitrius Settings File (Dimitrius is program author) .DGS AT Advanced Diagnostics File .DH Geoworks Dependency Information File .DHP Dr. Halo PIC .DHT Gauss Data File .DIA Computer Support Corp Diagraph Graphics File .DIB Device-Independent Bitmap Graphic [Viewer] .DIC Dictionary (various) .DIF Data Interchange Format .DIG Text Document Digilink Format Sound Designer Audio File .DIP Graphics File .DIR Procomm Plus Dialing Directory Macromedia Director File DEC VAX Directory .DIS Ray Tracer File DATAIR Data Import Specification Layout File VAX Mail Distribution File Corel Draw Thesaurus .DIT MS Win2000 Active Directory Schema .DIVX Movie Encoded with DivX-codec .DIZ Description In Zip File .DJV DjVu File .DJVU DjVu File .DKB DKBTrace Ray-Traced Graphics File .DL Animations file .DLD Lotus File .DLG Dialog Resource Script C++ Dialogue Script .DLK INMOS Transputer Development System Occam Compiler Link Info .DLL Dynamic Link Library CorelDraw Export/Import Filter .DLM Dirty Little Helper Cheat File .DLS Downloadable Sounds (Interactive Music Architecture) Norton DiskLock Setup File .DLU Dirty Little Helper Update File .DMD Visual dBASE Data Module .DMF Delusion/XTracker Digital Music File Packed Amiga Disk Image .DMG Macintosh OS X Disk Image File (Treated like a real disk) .DML Darn! Shopping! Mall File .DMO Demo .DMP Dump (various) INMOS Transputer Development System Occam Core Dump .DMS Compressed Archive .DNE Darn v5+ (Windows) Events List .DNS DynSite Plug-in File .DOB User Document Form File .DOC Document or Documentation (many programs/formats) MS Word Document DisplayWrite 4 File

.DOCX Document or Documentation (many programs/formats) MS Word Document 2007 (New) .DOG Laughing Dog Screen Saver .DOH Geoworks Dependency Information File .DOS Text File/DOS Specification Info .DOT MS Word Document Template Corel Lines-Definition .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 .DPJ DeskProto CAM Project File .DPK Delphi Package File .DPL Borland Delphi 3 Packed Library .DPP Serif DrawPlus Drawing .DPR Borland C++ (or Delphi) Default Project .DPT Publish-It! Publication File .DPX Digital Moving Picture Exchange .DQY MS Excel ODBC Query File .DR9 Directory File .DRC Orcad Schematic Capture Design Rules Check Report File .DRES Diagnosis Results .DRN Darn for DOS .DRS WordPerfect Driver Resource .DRV Device Driver .DRW Drawing (various) Micrografx Vector Graphic Pro/E Drawing .DS Chemisty Software .DS4 Micrografx Designer Graphics (ver 4) .DSC Oracle Discard File Nikon Coolpix Disk Identification File .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 .DSK Borland C++ or Turbo Pascal Project Desktop File Novell Driver 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 .DSR WordPerfect Driver Active Designer File .DSS Digital Soup Digital Sound File DCC Active Designer File Digital Speech Standard File (Voice Recorders & IBM's ViaVoice) .DST PC-RDist Distribution File .DST Embroidery Machines Graphics File .DSW MS Developer Studio Workspace Borland C++ Desktop Settings .DSX Active Designer Binary File .DT_ Macintosh Data File Fork .DTA Data (Various) .DTD SGML Document Definition File .DTEA Diagnosis Template Archive .DTF Q&A Database MS Exchange Header File (Used when sending to Lotus Notes) .DTM DigiTrekker Module

files in implementing dynamic web sites. .DTP SecurDesk! Desktop Timeworks Publisher Text Document Pressworks Template File .DTQ Database Tools Query .DUN Dial-Up Network .DUP Duplicate Backup .DV DESQview Script Digital Video File .DVC Lotus File .DVF DV Studio Camcorder Graphics File .DVI 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 .DWP Dweep Game Levels DeScribe Document File .DWS Dyadic Workspace File .DWT AutoCAD Template/Prototype File Macromedia Dreamweaver Template File .DX Document Imaging File Digital Electric Corporation (DEC) Data Exchange File .DXB Drawing Interchange Binary .DXF AutoCAD Drawing Interchange Format .DXN Fujitsu dexNet Fax Document .DXR Macromedia Director Protected Movie File .DYN Lotus File

.E00 ArcInfo Coverage Export File .EAC EmEditor Auto Completion File .EAL Enfocus Action List .EBJ Geoworks Error Checking Object File .EBO Microsoft Reader Ebook Format .ECC Ecchi Role-playing Format (Generally X-rated Anime File) .ECW Ensoniq Waveset Format EclipseCrossword Crossword Puzzle .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 .EDK Ensoniq KT Disk Image .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 .EFA Ensoniq ASR File .EFE Ensoniq EPS 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 Everex EFax Fax Document .EGA Ventura EGA Screen Characters .EL eMacs Lisp Source Code .ELC eMacs Lisp Byte-compiled Source Code .ELF Black Belt Systems Extended Layer File .ELI Encyclopedia Article List .ELM MS FrontPage Theme-Pack File .ELT Event List Text .EMB Everest Embedded Bank File .EMD ABT Extended Module .EMF Extended Windows Metafile Format [Viewer] .EML MS Outlook Express Electronic Mail .EMS PC Tools Enhanced Menu System Config .EMU Emulation .EMX Enigmacross Puzzle File .ENC UUENCODEd Encoded File Video File Knowledgeware Encyclopedia Encore Music File .END Corel Arrow Definition .ENG Dictionary Sprint Dictionary Engine File EnerGrahics Chart Graphics File .ENL Endnote Library File (for research papers) .ENR Enroute Toolath .ENV WordPerfect Environment WOPR Enveloper Macro .EP2 EclipsePackager Package .EPD Express Publisher Publication File .EPI Express Publisher Document File EclipsePackager Invoice .EPS Encapsulated PostScript [Viewer] Ventura Printer Font .EQN WordPerfect Equation .ER1 ERWin File .ERD Entity Relationship Diagram .ERM Entity Relationship Diagram Model .ERR Error Log (various) .ERX ERWin File .ESF Emblaze Audio File .ESH Extended Shell Batch File .ESI Esri Plot File .ESL MS Visual FoxPro Distributable Support Library .ESP Ventura File .ESS The Scientific Word Processor Style Sheet .EST MS Streets & Trips 2001 Trip File .ESY EmEditor Syntax File .ETA eTreppid Audio File (eTplayer & ETVC media CODEC) .ETC eTreppid Compressed 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 .EV2 Java File .EVT PC Tools Event File Scheduler MS WinNT/2000 Event Log .EVY Envoy Document .EWD Express Publisher for Windows Document .EWL MS Encarta Document EclipseCrossword Word List .EX3 Harvard Device Driver (Harvard Graphics taken over by Serif) .EXC QEMM Exclude File REXX Program MS Word Exclusion Dictionary Text Document .EXE Executable File .EXP ICQ Saved Chat File .EXT Norton Commander Extension File WS-FTP ASCII Binary Transfer File .EYB Encyclopedia Yearbook File .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

.F Compressed Archive File (UNIX) FORTRAN Program .F01 Perfect Fax Document .F06 DOS 6 Pixel Screen Font .F07 DOS 7 Pixel Screen Font .F08 DOS 8 Pixel Screen Font .F09 DOS 9 pixel Screen Font .F10 DOS 10 Pixel Screen Font .F11 DOS 11 Pixel Screen Font .F12 DOS 12 Pixel Screen Font .F13 DOS 13 Pixel Screen Font .F14 DOS 14 Pixel Screen Font .F15 DOS 15 Pixel Screen Font .F16 DOS 16 Pixel Screen Font .F2R Farandoyle Linear Module Format .F3R Farandoyle Blocked Module Format .F32 Raw 32-bit IEEE Floating Point Values .F64 Raw 64-bit IEEE Floating Point Values .F77 FORTRAN 77 Program .F90 FORTRAN Program .F96 Frecom FAX96 Document .FA1 DATAIR FAS 87/132 Reporter Data File .FA2 DATAIR FAS 87/132 Reporter Custom text File .FAC FACE Graphic .FAQ Frequently Asked Questions .FAR Farandoyle Tracker Music Module .FAS 3D Fassade Plus Basic Module .FAV MS Outlook Bar Shortcuts .FAX Fax File .FBC FamilyTree Compressed Backup File .FBK Navison Financials Backup FamilyTree Backup File .FBM Fuzzy Bitmap .FBS File Burner Skin .FC Harvard Dictionary (Harvard Graphics taken over by Serif) .FCD Virtual CD-ROM FastCAD/EasyCAD Output Patton & Patton Flow Charting 3 File IsoBuster File .FCM Forward Compression Binary File Patch .FCT Foxpro Catalog Campaign Cartographer 2 File .FCW Campaign Cartographer 2 File .FD FORTRAN Declarations Dataflex Field Compiler Offsets .FDB Navison Financials Database Art Explosion Portfolio Catalog File .FDF Adobe Acrobat Forms Document .FDR Final Draft Document File .FDW F3 Design and Mapping Document Form .FDX Force Index .FEB WordPerfect Figure Editor Button Bar .FEM CADRE Finite Element Mesh File .FEX Focus File .FF AGFA CompuGraphics Outline Font Description .FFA MS Fast Find File .FFF GUS PnP Bank defFax Fax Document .FFL MS Fast Find File PrintMaster Gold Image File .FFO MS Fast Find File .FFT DCA/FFT Final Form Text .FFX MS Fast Find File .FGA Folder Guard Attributes .FGD Folder Guard Data .FGP Folder Guard Passwords File .FH3 Aldus Freehand 3 Drawing .FH4 Aldus Freehand 4 Drawing .FI FORTRAN Interface File .FIF Fractal Image Format .FIG REND386/AVRIL Graphic .FIL dBase Files List Object WordPerfect Overlay Application Generator File Template .FIM Construsyc/Instasyc File .FIN WordPerfect Print Format Text Perfect Writer Print Formatted Text .FIRE FireStarter Project File .FISH 3d Fish Tank Saved Fish .FISHES 3d Fish Tank Saved Fishes .FISHTANK 3d Fish Tank Saved Fishtank .FIT FITS Graphic MS Windows NT File Index Table .FIX Generic Patch File .FKY Foxpro Macro .FLA Macromedia Flash Movie .FLB Papyrus Format Library .FLC AutoDesk FLIC Animated Picture FLIC Video (may be same as above) .FLD Charisma Folder Hijaak Thumbnail Folder 3D Fassade Plus Field Define Module File .FLF Corel Paradox Form OS/2 Driver File Navison Financials License File .FLI Autodesk FLIC Animation EmTeX Font Library .FLL Foxpro Library .FLM AutoCAD Film .FLO MicroGrafx FlowCharter File .FLP Fruityloops Saved File .FLR Live3D File .FLS Farrukh Imposition Purlisher Filelist Document .FLT Corel Graphic Filter StarTrekker Music Module MulitGen Open Flight File Asymetrix Graphics Filter Support File Micrografx Picture Publisher Filter MS Graphics Filter .FLX Image File Dataflex Ordered Binder DataFlex Compiled Binary File .FM Adobe FrameMaker Document FileMaker Pro Spreadsheet .FM1 Lotus Spreadsheet File .FM3 Harvard Device Driver (Harvard Graphics taken over by Serif) 1-2-3 Format File .FMB WordPerfect File Manager Button Bar Oracle Binary Form Source Code .FMD Open Access File .FMF IBM LinkWay Font or Icon .FMK PowerStation FORTRAN Make File .FML GetRight File Mirror List Oracle Mirror List .FMO dBase Ordered Format .FMP FileMaker Pro Document .FMT Format File Style Sheet Oracle Text Form Format MS Schedule+ Print File MS Visual FoxPro Csreen Format File .FMV Frame Vector Metafile .FMX Oracle Executable Form .FN3 Harvard Graphics Font .FND MS Explorer Saved Search .FNG Font Navigator Group File .FNK FunkTracker Module .FNO Folio Infobase [May be mistype of .NFO] .FNT Font File (Windows 3.1) .FO1 Borland Turbo C Font .FO2 Borland Turbo C Font .FOG Fontographer Font .FOL 1st Reader Saved Message Folder .FON Font File Procomm Plus Call Log .FOR FORTRAN Source WindowBase Form .FOT Installed TrueType Font .FOX FoxBase File .FP FileMaker Pro File .FP1 Flying Pigs for Windows Data .FP3 FileMaker Pro File .FP5 FileMaker Pro Document .FPC FoxPro Catalog File .FPT FileMaker Pro File FoxPro Memo Fields .FPW FloorPlan Plus Floorplan Drawing .FPX FlashPix Bitmap [Viewer] .FQF FlashFXP Queue File .FR3 dBase IV Renamed dBaseIII+ Form .FRF FontMonger Font .FRG dBase IV Uncompiled Report .FRL FormFlow File .FRM Form File FrameMaker Document FrameBuilder Document Oracle Executable Form Visual Basic Form WordPerfect Merge Form DataCAD Symbol Report File .FRO dBase IV Compiled Report FormFlow File .FRP PerForm Pro Plus Form .FRS WordPerfect Graphics Driver .FRT FoxPro Report File .FRX Visual Basic Binary Form File FoxPro Report File .FRZ FormFlow File .FSC Campaign Cartographer 2 File .FSF Convert It! Factor File fPrint Audit Tool File .FSL Borland's Paradox 7 Forms Corel Paradox Saved Form .FSM Farandoyle Sample Format .FSS Iomega Backup File Selection Set .FST FastStats Analyzer File dbFast Linkable Program .FSX Lotus 1-2-3 Data .FT Lotus Notes Full Text Index .FTB Roots3 Index File .FTG Windows Help Full-text Search Group File .FTM Family File MicroGrafx Font .FTS Windows Help Full-Text Search Index File .FTV Forest & Trees File .FTW Family File .FVF Fluke View .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 .FXO Fax Image Document [Open with Quick view Plus] .FXP FoxPro Compiled Source .FXR WinFax Received Document (TIFF format) .FXS WinFax Fax Transmit Graphic .FZB Casio FZ-1 Bank Dump .FZF Casio FZ-1 Full Dump .FZV Casio FZ-1 Voice Dump

.G3 G3 FAX File [Viewer] .G32 GFA BASIC 32 Program File .G3F Zetafax TIFF File (fine resolution) .G3N Zetafax TIFF File (normal resolution) .G4 GTX RasterCAD File .GAC Global Audio Control Skin .GAL Gallery of Pictures Corel Multimedia Manager Album .GAM GammaFax Fax Document .GAT Gator File .GB Chinese Nintendo GameBoy Emulator ROM Image File .GBA Nintendo® Game Boy Advance ROM Image GrabIt Batch Files .GBC Nintendo® GameBoy Color Emulator ROM Image File .GBK Interbase Database Backup .GBL VAXTPU Global Definitions (VAXTPU is default OpenVMS editor) .GC Sierra Print Artist File .GC1 Golden Common Lisp Source Code .GC3 Golden Common Lisp Source Code .GCA GOCA Graphics File .GCD Generic CADD Drawing IsoBuster File .GCF WinXComp Grouped Compressed File .GCI GTA2 Game File .GCP Ground Control Point File (map projection) .GDB Interbase Database .GDM Bells, Whistles, and Sound Boards Module .GDS Image File .GED GEDCOM Family History File Graphic Environment Document Arts & Letters Graphics File .GEM GEM (a desktop interface) File 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 .GFA Bitmap Graphics File .GFC Patton & Patton Flowcharting 4 File .GFI Genigraphics Graphics Link Presentation .GFT NeoPaint Font .GFX Genigraphics Graphics Link Presentation .GHO Symantec Ghost Disk Image File .GID Windows Help Index File .GIF Graphic Interchange Format [Viewer] .GIM Genigraphics Graphics Link Presentation .GIX Genigraphics Graphics Link Presentation .GKH Ensoniq EPS Family Disk Image .GKS Gravis GripKey Document .GL GRASP - Graphical System for Presentation File .GLY MS Word Glossary .GMP GTA2 Game File .GMR Schlafhorst Automation Graphical Monitor Record .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 .GOC Geoworks Goc Source Code .GOH Geoworks Goc Header .GP Geoworks Glue Geode Parameter File .GP3 CCITT Group 3 File (fax) .GP4 CCITT Group 4 File (fax) .GPF Believed to be a Japanese graphic file .GPH Lotus 1-2-3 Graph .GPK Omnigo Program Package [Added Info] .GPP GraphPap Graph Paper File Serif GraphicsPlus Object .GR2 Windows 3.0 Screen Driver .GR3 Windows 3.0 Screen Grabber .GRA Flight Simulator File MS Graph Chart SigmaPlot Data File .GRB MS-DOS Shell Monitor .GRD Gradebook Power File Map Projection Grid File .GRF Graph Golden Software Graph File Grafix Idea File Graph Edit File [Part of DirectX SDK] .GRN Granny 3D Rendering Program .GRP Program Manager Group .GRV Groove Networks File .GRX GetRight File List .GRY Picture File .GSM Raw GSM 6.10 Audio Stream US Robotics Modem File .GSP Geometer's Sketchpad Material File .GT2 Graoumftracker Music Module (new) .GTK Graoumftracker Music Module (old) .GTY Gibson Tray File .GUP PopMail Data .GWP Greetings WorkShop File [Now MS Picture It!] .GWX Genigraphics Graphics Link Presentation .GWZ Genigraphics Graphics Link Presentation .GX1 Show Partner Graphics File .GX2 Show Partner Graphics File .GXL Genus Graphics Library .GXT GTA2 Game File .GZ Gzip Compressed Archive

.H Header (Usually C Compiler) .H! Flambeaux Tutorial Database .H++ C++ Header File .H-- Sphinx C-- Header File .HA Compressed Archive .HAM Image File .HBK Mathcad Handbook Humanic Software Accounting Data .HCM IBM HCM Configuration .HCR IBM HCD/HCM Production Configuration .HDA HotDocs Document .HDF Hierarchical Data Format File .HDL Procomm Plus Alternate Download File Listing .HDR Procomm Plus Message Header PC-File+ Database Header .HDW Harvard Draw Vector Graphics .HDX Help Index (Various) .HED HighEdit Document .HEL MS Hellbender Saved Game .HEX Hex Dump Macintosh BinHex 2.0 File .HFI HP Font Info .HFX HotFax File US Robotics Rapid Comm Voice Data File .HGL HP Graphics Language (plotter) [SwiftView] .HH C++ Header Help Topic Map File .HHC Table of Contents File (HHW Application) TurboTax Contents File .HHH Power C Precompiled Header .HHK Help Workshop Index File .HHP Procomm Plus Help Data .HHP HTML Help Project .HIT HitPlayer Audio File .HJT TreePad Hypertext Database File .HLP Windows Help File .HM2 Help&Manual Help File Project .HMI Descent Human Machine Interfaces MIDI File .HMM Procomm Plus Alternate Mail Read Option Menu .HMP Descent Human Machine Interfaces MIDI File .HM~ Help&Manual Backup Help File Project .HOF Hall Of Fame (scores) .HOG Lucas Arts Dark Forces WAD File Descent Mission File .HP HP Graphics Language (plotter) [SwiftView] .HPF PageMaker HP LaserJet Fonts HotLine Partial Download File .HPG HP Graphics Language (plotter) [SwiftView] .HPGL HP Graphics Language (plotter) [SwiftView] .HPI Gem Font Information Hemera Photo-Object Image .HPJ Help Project File .HPK Compressed Archive .HPL HP Graphics File .HPM Procomm Plus Alternative Menu .HPP C++ Program Header InfoMgr Database File .HPR RoboHELP Configuration File .HQX Binhex Text Conversion File (Macintosh) .HRL Herolab EasyWin32 .HPM Procomm Plus Alternate Main Menu .HPP Zortech C++ Header .HPR RoboHelp Configuration .HQX Macintosh BinHex 4 Compressed Archive .HRM Procomm Plus Alternate Main Menu .HRX Herolab EasyWin32 .HRZ Image File .HS Hugs Source Code .HSC HelpScribble Project .HSI Handmade Software Graphic File .HSQ Data File Associated with Qaz Trojan .HSS Photoshop Hue/Saturation Information .HST History File Procomm Plus History File Host File .HT HyperTerminal .HTA Hypertext Application (run apps from HTML doc) .HTACCESS Apache Access Configuration File .HTF WebBase File .HTI WebBase File .HTM Hypertext Markup Language (HTML) .HTT Hypertext Template .HTX Extenended Hypertext Template Internet Database Connector File .HUS Husqvarna Designer I Embroidery Machine Format .HUY Eto Dlia Vas .HWP Hangul (Korean) Word Processor File .HXM Procomm Plus Alternate Protocol Selection Menu Descent2 HAM File .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 Compressed Archive .HZ Chinese

            Sterling merged with Computer Associates.
  .IBA  MDE InfoHandler Infobase File
  .IBM  Image File
  .ICA  Citrix File
        IOCA Graphics File
  .ICB  Targa Bitmap
  .ICC  Kodak Printer Image
  .ICE  Archive File
  .ICL  Icon Library File (various) ImageForge/IconForge  [Viewer]
  .ICM  Image Color Matching Profile File
  .ICN  Icon Program
  .ICO  Icon  [Viewer]
  .ICS  Outlook Calendar File
        SwiftView Command File
  .ID   Disk Identification File
        Lotus Notes ID File
  .IDA  MS Server File (default.ida is attacked by the Code Red Worm)
  .IDB  MS Developer Intermediate File
  .IDD  MIDI Instrument Definition
  .IDE  Integrated Development Environment Configuration File
        Sophos Anti-Virus Virus IDEntity File
  .IDF  MIDI Instruments Drivers File
  .IDQ  Internet Data Query File
  .IDW  Aldus IntelliDraw Vector Graphic
  .IDX  Index (multiple programs)
  .IEF  Image File
  .IES  Photometric File Data [Illuminating Engineering Society]
  .IFD  Jet Form Design Form
  .IFF  Graphic, Sound (Interchangeable File Format)  [Viewer]
  .IFS  OS/2 System File
        IconForge Image EXE Library
  .IGF  Inset Systems Metafile
  .IGP  Igor Reader Sheet Music File
  .IGS  IGES-Format
  .IIF  QuickBooks for Windows Interchange File
  .III  Intel Phone Compatible
  .IL   Icon Library
  .IM8  Sun Raster Graphic
  .IMA  WinImage File
  .IMF  ImageForge/ImageForge Image EXE Library
  .IMG  Bitmap Graphic (several programs)  [Viewer]
        CloneCd Related File
  .IMP  Urban Chaos Game File
        Lotus Improv Spreadsheet
  .IN3  Harvard Input Device Driver (Harvard Graphics taken over by Serif)
  .INC  Include File (various)
  .IND  dBase IV or DataPerfect Index
  .INDD  Adobe Indesign Document
  .INF  Information or Setup File
  .INI  Initialization file (many)
  .INK  Pantone Reference File
        Mimio Ink File [Electronic Whiteboard]
  .INL  MS Visual C++ Inline Function File
  .INP  Oracle Source Code
  .INS  Internet Communication Setting
        WordPerfect File
        Ensoniq EPS Family Instrument
        Sample Cell / II Instrument
        InstallShield Script
        X-Internet Sign-up File
        Inspiration Mind Mapping Software File
  .INT  Borland Interface Units
        Foxpro Code Page
        Intermediate Code used for syntax checking (various)
  .INX  Foxbase Index
  .IO   Compressed Archive  

  .IOB  Imagine File
  .IOF  Findit Document
  .ION  Text Program/Installation Description
  .IP   IconPackager Icon Set
  .IPD  InstallPROG 6 EDBS Install Database
  .IPF  Microsoft SMS Installer Script (with System Management Server 2.0)
  .IPL  Corel Pantone Spot Reference Palette
        InstallPROG 6 EDBS File Library
  .IPX  Interactive Pictures Corporation AV File
  .IQY  Excel Web Query
  .IRS  WordPerfect Resource File
  .ISD  RapidFile Dictionary
  .ISH  Compressed Archive File
  .ISO  File List for CD-ROM
        ISO Buster File
  .ISP  X-Internet Sign-up File
        Internet Communication Settings
  .ISS  InstallShield Response File
  .IST  Digitrakker Instrument File (by n-FaCToR)
  .ISU  InstallShield Uninstall Script
        Netscape File
  .IT   Impulse Tracker Music Module
  .ITI  Impulse Tracker Instrument
  .ITS  Internet Document Set
        Impulse Tracker Sample
  .IV   VRML File
        Open Inventor File
  .IVF  Indeo Video File
  .IW   Iconware Application
        Idlewild Screensaver
  .IWA  IBM Writing Assistant Text
  .IWC  Installwatch Database (install monitor)
  .IWP  Wang Text File
  .IX   Framemaker Index File
        Paperport Search File

.J62 Ricoh Camera File .JAR Java Archive File .JAS Compressed Graphic .JBC Jam Byte-Code Hex File (8051 Microprocessor File) BestCrypt File .JBD SigmaScan Data File .JBF Paint Shop Pro Browser File .JBK Juno Backup File .JBX Project Scheduler File .JDF Turok 2 Game File .JEF Janome NH10000 Sewing Machine File .JFF JPEG Image .JFI Image File .JFX J2 Fax File .JIF JPEG Image .JIS Japanese .JMP SAS JMPDiscovery Chart-to-statistics File .JMS Voxtron TeleButler Graphical Voice Response Call Flow .JN1 Epic MegaGames Jill of the Jungle Data File .JNB Sigma Plot Workbook File .JNG JPEG Network Graphic .JNK Junk (temporary file) .JNL Ingres Journal File .JOB Job File Task Scheduler Task Object AI Research File QuestVision Vector Graphics File (IMG File Conversion) .JOR MS SQL Server Journal File .JOU VAX Edt Editor Journal Backup .JPC Picture File (Japanese) .JPE JPEG Image .JPG JPEG Image [Viewer] .JS JavaScript Source Code .JSB Henter-Joyce, Inc. Jaws Script Binary File (Screen reader program) .JSD eFAX Jet Suite Document Henter-Joyce, Inc. Jaws Script Documentation File (Screen reader program) .JSE JScript Encoded Script File .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 .JTF JPEG Tagged Interchange Format Image .JTK Sun Java ToolKit File .JTP JetForm File .JW Justwrite Text .JWL Justwrite Text File Library .JZZ Jazz Spreadsheet

.K25 Kurzweil 2500 Sample Kodak DC25 Digital Camera File .KAR Karaoke MIDI File .KB Borland C++ Keyboard Script Knowledge Pro Source Code .KBD Keyboard Script File Layout (various) .KBI Keirsey-Bates Temperament Sorter Index .KBM Reflection Keyboard Script File Layout .KBP Keirsey-Bates Temperament Sorter Profile .KBR Keirsey-Bates Temperament Sorter Data .KCL Kyoto Common LISP Source Code .KDC Kodak Photo-Enhancer [Viewer] .KED KEDIT Profile and Macro File (DOS-based version of IBM XEDIT) .KEX KEDIT Profile File (? - not verified -?} .KEY Keyboard Macros Forecast Pro Datafile Program Security or Registration File (various) DataCAD Icon Toolbar File .KFX KoFax Group 4 Image .KIZ Kodak Digital Postcard File .KKW RoboHELP Keyword Help project Index File .KMP Korg Trinity KeyMaP File .KNO Personal Knowbase File .KOS MicroType Pro Document .KPP SmartPad Toolpad .KPS IBM KIPS Bitmap .KQP Konica Camera File .KR1 Kurzweil 2000 Sample (multi-floppy) .KRY Herolab Krypten .KRZ Kurzweil 2000 Sample .KSC Korg Trinity Script .KSE Keepsake Studio Export File .KSF Korg Trinity Sample .KSH Prodigy Internet Registration File .KTT KeyText Data File .KUMAC Physics Analysis Workstation Macro File .KYB Keyboard Layout .KYE Kye Game Data

.L LEX Program File Link Instructions LISP Program File .LA Lightscape Animation .LAB Mailing Labels .LAT Crossword Express Lattice File .LAY Applause Word Chart Layout Lightscape Layer State .LBG dBase IV Label Generator .LBI Dreamweaver Library File .LBL Labels (various) .LBM Deluxe Paint Bitmap Graphic [Viewer] .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 .LCF Linker Control File .LCH PagePath Technologies LAUNCH! File .LCK MS Frontpage-related File Adobe Pagemaker Database File .LCN WordPerfect Dictionary File .LD Telix Long Distance Codes .LD1 dBase Overlay File .LDB MS Access Lock File TrueVector Log Database .LDD Laser Dispatch Data .LDF LuraDocument File [Viewer] MS SQL Server Transaction Log File .LDL Corel Paradox Delivered Library .LDS Laser Dispatch Script .LEG Legacy Graphic Format .LES Learn Lesson File Logitech Entertainment Game Profile .LET Letter .LEX Lexicon (dictionary file) .LFA LifeForm File .LFM LifeForm File .LFP LifeForm File .LFT Chiwriter Laser Printer Font 3D Studio Loft File .LGC Program Use Log File (for Windows Program Use Optimization) .LGO MS Windows Logo Driver .LGP Logotron SuperLogo File .LGT Urban Chaos Game File .LHA Compressed Archive File (LZH) .LHS Literate Haskell Source File .LHW Compressed Amiga Archive File .LHZ LHA Compressed Archive File .LIB Program Library (diverse programmers' languages) .LIC License File (various Shareware) .LIF Compressed Archive File HP Logical Interchange Format File .LIN AutoCAD Line Art .LIS Program Listing Structured Query Reporting (SQR) Output .LIT MS Reader EBook File .LIX Logos Book File .LJ Text File for HP LJ II Printer .LKO MS Outlook Express Linked Object .LL3 LapLink III Document File .LLC LapLink Saved Connection File .LLX Laplink Exchange Agent .LM8 Picture File .LMD Tune Smithy List of Modes for a Musical Scale .LND 3D Landscape Data .LNK Linker File Windows Shortcut File .LOG Log File (many different programs) .LOK FileWrangler/ZipWrangler/SecurDesk! Encrypted Archive .LP LP88 Linear Programming for the IBM-PC File Lightscape Preparation File .LPA LPA-View Laser Particle Analyser Test Analysis Software .LPB LP88 Linear Programming for the IBM-PC File .LPD Helix Nuts and Bolts File (Helix Software now part of McAfee) .LQF Leech FTP Save Queue File .LRC Intel Video Phone File .LRF Linker Response File .LRS WordPerfect Language Resource File .LS Lightscape Solution File .LSC Tune Smithy List of Muscial Scales .LSF Streaming Audio/Video File Logos Book File .LSL Corel Paradox Saved Library Lotus Script Library .LSP LISP Program File .LST Listing or List (e.g., packing list) PowerPoint File Ingres Dump List File Oracle Spool File .LSX Streaming Audio/Video Shortcut .LTM Lotus Form .LTR Letter .LU ThoughtWing Library Unit File .LVL Parallax Miner Descent/D2 Level Extension .LVP Lucent Voice Player (Intuity Audix Multimedia Messaging System) .LWF LuraWave-compressed Graphic File [Viewer] .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 .LYT TurboTax Log File SignMaking Application Extension .LZH Compressed Archive File .LZS Compressed Archive File Skyroads Data File .LZW Compressed Amiga Archive File .LZX Compressed File

.M Matlab Function Macro Source Mathematica File .M Limbo Interface Declaration (Inferno OS) .M?? Ingres Modify Table/Index File (?? = Hex 00 to FF) .M18 Accolade Golf Course File .M1V MPEG File .M2V MPEG-2 File .M3 ModuleA 3 Program File .M3A MPEG Archive Enhanced .M3U Playlist File .M3D 3D Animations Macro Corel Motion 3D Animation .M3U MPEG URL .MA3 Harvard Macro (Harvard Graphics taken over by Serif) .MAC MacPaint Bitmap Graphic Macro (various) .MAD MS Access Module Shortcut .MAF MS Access Form Shortcut .MAG Picture File MS Access Diagram Shortcut .MAI Mail .MAK Make File (compiler project file) .MAM MS Access Macro Shortcut .MAN Manual .MAP Image Color Palette Duke Nukem WAD File Ingres Termcap Mapping File Linker Map Micrografx Picture Publisher Format Data .MAQ MS Access Query Shortcut .MAR MS Access Report Shortcut .MAS Focus Master Data Definition MS Access Stored Pro