Here you go with all the file formats ever known.
- ABK Corel Draw AutoBackup
 - ACL Corel Draw 6 keyboard accelerator
 - ACM Used by Windows in the system directory
 - ACP Microsoft Office Assistant Preview file
 - ACT Microsoft Office Assistant Actor file
 - ACV OS/2 drivers that compress and decompress audio data
 - AD After Dark screensaver
 - ADB Appointment database used by HP 100LX organizer
 - ADD OS/2 adapter drivers used in the boot process
 - ADM After Dark MultiModule screensaver
 - ADP Used by FaxWorks to do setup for fax modem interaction
 - ADR After Dark Randomizer screensaver
 - AFM Adobe font metrics
 - AF2 ABC Flowchart file
 - AF3 ABC Flowchart file
 - AI Adobe Illustrator drawing
 - AIF Apple Mac AIFF sound
 - ALB JASC Image Commander album
 - ALL Arts & Letters Library
 - AMS Velvert Studio music module (MOD) file
 - ANC Canon Computer Pattern Maker file that is a selectable list of pattern colors
 - ANI Animated Cursor
 - ANS ANSI text
 - API Application Program Interface file; used by Adobe Acrobat
 - APR Lotus Approach 97 file
 - APS Microsoft Visual C++ file
 - ARC LH ARC (old version) compressed archive
 - ARJ Robert Jung ARJ compressed archive
 - ART Xara Studio drawing
 - ART Canon Crayola art file
 - ASA Microsoft Visual InterDev file
 - ASC ASCII text
 - ASD WinWord AutoSave
 - ASM Assembler language source file
 - ASP Active Server Page (an HTML file containing a Microsoft server-processed script)
 - ASP Procomm Plus setup and connection script
 - AST Claris Works "assistant" file
 - ATT AT&T Group 4 bitmap
 - AVI Microsoft Video for Windows movie
 - AWD FaxView document
 - BAK Backup file
 - BAS BASIC code
 - BAT Batch file
 - BFC Windows 95 Briefcase document
 - BG Backgammon for Windows game
 - BI Binary file
 - BIF GroupWise initialization file
 - BIN Binary file
 - BK Sometimes used to denote backup versions
 - BK$ Also sometimes used to denote backup versions
 - BKS An IBM BookManager Read bookshelf
 - BMK An A bookmark file
 - BMP Windows or OS/2 bitmap
 - BM1 Apogee BioMenace data file
 - BRX A file for browsing an index of multimedia options
 - BSP Quake map
 - BS1 Apogee Blake Stone data file
 - BTM Batch file used by Norton Utilities
 - B4 Helix Nuts and Bolts file
 - C C code
 - CAB Microsoft cabinet file (program files compressed for software distribution)
 - CAL CALS Compressed Bitmap
 - CAL Calendar schedule data
 - CAS Comma-delimited ASCII file
 - CAT IntelliCharge categorization file used by Quicken
 - CB Microsoft clean boot file
 - CCB Visual Basic Animated Button configuration
 - CCF Multimedia Viewer configuration file used in OS/2
 - CCH Corel Chart
 - CCM Lotus CC:Mail "box" (for example, INBOX.CCM)
 - CDA CD Audio Track
 - CDF Microsoft Channel Definition Format file
 - CDI Phillips Compact Disk Interactive format
 - CDR Core Draw drawing
 - CDT Corel Draw template
 - CDX Corel Draw compressed drawing
 - CEL CIMFast Event Language file
 - CFB Comptons Multimedia file
 - CFG Configuration file
 - CGI Common Gateway Interface script file
 - CGM Computer Graphics Metafile
 - CH OS/2 configuration file
 - CHK File fragments saved by Windows Disk Defragmenter or ScanDisk
 - CHP Ventura Publisher chapter
 - CIL Clip Gallery download package
 - CIM Sim City 200 file
 - CIN OS/2 change control file that tracks changes to an INI file
 - CK1 iD/Apogee Commander Keen 1 data file
 - CK2 iD/Apogee Commander Keen 2 data file
 - CK3 iD/Apogee Commander Keen 3 data file
 - CK4 iD/Apogee Commander Keen 4 data file
 - CK5 iD/Apogee Commander Keen 5 data file
 - CK6 iD/Apogee Commander Keen 6 data file
 - CLASS Java class
 - CLP Windows Clipboard file
 - CLS Visual Basic Class Module
 - CMD Command file for Windows NT (similar to a DOS .BAT file)
 - CMD DOS CP/M command file
 - CMD dBase-II program file
 - CMF Corel Metafile
 - CMP JPEG Bitmap
 - CMP Address document
 - CMV Corel Move animation
 - CMX Corel Presentation Exchange image
 - CNF Configuration file used by Telnet, Windows, and other applications
 - CNM Windows application menu options and setup file
 - CNQ Compuworks Design Shop file
 - CNT Windows (or other) system content files for the help index and other purposes
 - COB trueSpace2 object
 - COD Microsoft C compiler output as displayable assembler with original C as comments
 - COM Command file (program)
 - CPD Fax Cover document
 - CPE Fax Cover document
 - CPI Microsoft MS-DOS code page information file
 - CPL Control Panel extension
 - CPL Corel colour palette
 - CPP C++ code
 - CPR Corel Presents Presentation
 - CPT Corel Photo-Paint image
 - CPX Corel Presentation Exchange Compressed drawing
 - CRD Cardfile file
 - CRP Corel Presents Run-Time Presentation
 - CRT Certificate file
 - CSC Corel Script
 - CSP PC Emcee On-Screen image
 - CSV Comma-separated values file
 - CT Scitex CT Bitmap
 - CTL Used in general to mean a file containing control information.
 - CUE Microsoft Cue Cards data
 - CUR Windows Cursor
 - CUT Dr Halo bitmap
 - CV Corel Versions archive
 - CV Microsoft CodeView information screen
 - CWK Claris Works data file
 - CWS Claris Works template
 - CXX C++ source code file
 - DAT Data file
 - DAT WordPerfect Merge Data
 - DBF Aston-Tate dBASE database
 - DBX DataBeam image
 - DCR Shockwave file
 - DCS Desktop Color Separation file
 - DCX Fax image (based on PCX)
 - DDF BTRIEVE database
 - DEF SmartWare II data file
 - DEF C++ Definition
 - DER Certificate file
 - DIB Device-Independent Bitmap
 - DIC Dictionary
 - DIF Data Interchange Format spreadsheet
 - DIR Macromedia Director file
 - DIZ Description file
 - DLG C++ Dialogue Script
 - DLL Dynamic-Link Library
 - DMF X-Trakker music module (MOD) file
 - DOC FrameMaker or FrameBuilder document
 - DOC WordStar document
 - DOC WordPerfect document
 - DOC Microsoft Word document
 - DOT Microsoft Word document Template
 - DPR Borland Delphi project header file
 - DRV Driver
 - DRW Micrografx Designer/Draw
 - DSG DooM saved game
 - DSM Dynamic Studio music module (MOD) file
 - DSP Microsoft Developer Studio project
 - DSQ Corel QUERY file
 - DSW Microsoft Developer Studio workspace
 - DWG AutoCAD drawing eXchange format
 - DXF AutoDesk Drawing Interchange format
 - EMF Enhanced Windows Metafile
 - ENC Encore file
 - EPS Encapsulated PostScript image
 - ER1 ERWin file
 - ERX ERWin file
 - EVY Envoy document
 - EWL Microsoft Encarta document
 - EXE Executable file (program)
 - F FORTRAN file
 - F77 FORTRAN file
 - F90 FORTRAN file
 - FAR Farandole Composer music module (MOD) file
 - FAV Microsoft Outlook navigation bar
 - FAX FAX Type image
 - FH3 Aldus Freehand 3 drawing
 - FIF Fractal image file
 - FITS CCD camera image
 - FLC AutoDesk FLIC animation
 - FLI AutoDesk FLIC animation
 - FLT Corel filter
 - FLT StarTrekker music module (MOD) file
 - FMB Oracle binary source code for form, version 4.0 and later
 - FMT Oracle text format of form, version 4.0 and later
 - FMT Microsoft Schedule+ print file
 - FMX Oracle executable form, version 4.0 and later
 - FOG Fontographer font
 - FON System font
 - FOR FORTRAN file
 - FOT Font-related file
 - FP FileMaker Pro file
 - FP1 Flying Pigs for Windows data file
 - FP3 FileMaker Pro file
 - FPX FlashPix bitmap
 - FRM Form
 - FRM FrameMaker or FrameBuilder document
 - FRM Oracle executable form version 3.0 and earlier
 - FRM Visual Basic form
 - FRM WordPerfect Merge form
 - FRX Visual Basic form stash file
 - GAL Corel Multimedia Manager album
 - GCP Ground Control Point file used in image processing of remote sensing data .
 - GED Graphic Environment Document (drawing)
 - GEM GEM metafile
 - GEN Ventura-Generated text file
 - GFC Patton&Patton Flowcharting 4 flowchart file
 - GFI Genigraphics Graphics Link presentation
 - GFX Genigraphics Graphics Link presentation
 - GID Windows 95 global index file (containing help status)
 - GIF CompuServe bitmap
 - GIM Genigraphics Graphics Link presentation
 - GIX Genigraphics Graphics Link presentation
 - GNA Genigraphics Graphics Link presentation
 - GNX Genigraphics Graphics Link presentation
 - GRA Microsoft Graph
 - GRD Grid file, used in image processing of remote sensing data often to form map projections.
 - GRP Program Manager Group
 - GTK Graoumftracker (old) music module (MOD) file
 - GT2 Graoumftracker (new) music module (MOD) file
 - GWX Genigraphics Graphics Link presentation
 - GWZ Genigraphics Graphics Link pres
 - H C program header
 - HED HighEdit document
 - HEL Microsoft Hellbender saved game
 - HEX Macintosh BinHex 2.0 file
 - HGL HP Graphics Language drawing
 - HLP Help file
 - HOG Lucas Arts Dark Forces WAD file
 - HPJ Visual Basic Help Project
 - HPP C++ program header
 - HQX Macintosh BinHex 4.0 file
 - HST History file
 - HT HyperTerminal
 - HTM Hypertext document
 - HTML Hypertext document
 - HTX Extended HTML template
 - ICA Citrix file
 - ICB Targa bitmap
 - ICM Image Color Matching profile file
 - ICO Windows Icon
 - IDD MIDI Instrument Definition
 - IDQ Internet Data Query file
 - IFF Amiga ILBM
 - IGF Inset Systems metafile
 - IIF QuickBooks for Windows interchange file
 - IMA WinImage file
 - IMG GEM image
 - INC Assembler language or Active Server include file
 - INF Information file
 - INI Initialization file
 - INP Oracle source code for form, version 3.0 and earlier
 - INS InstallShield install script
 - INS X-Internet sign-up file
 - ISO Lists the files on a CD-ROM; based on the ISO 9660 CD-ROM file system standard
 - ISP X-Internet sign-up file
 - ISU InstallShield uninstall script
 - IT Impulse Tracker music module (MOD) file
 - IW Idlewild screensaver
 - JAR Java ARchive file (a compressed file for applets and related files)
 - JAVA Java source code
 - JBF Paint Shop Pro image browser file
 - JFF JPEG bitmap
 - JIF JPEG bitmap
 - JMP SAS JMPDiscovery chart-to-statistics file
 - JN1 Epic MegaGames Jill of the Jungle data file
 - JPEG JPEG bitmap
 - JPG JPEG bitmap
 - JS JavaScript source code
 - JTF JPEG bitmap
 - KDC Kodak Photo-Enhancer
 - KFX KoFax Group 4 image
 - KYE Kye game data
 - LBM Deluxe Paint bitmap
 - LDB Microsoft Access lock file
 - LEG Legacy document
 - LHA Alternate file suffix for LZH
 - LIB Library
 - LIS Output file produced by a Structured Query Reporting (SQR) program
 - LOG Log file
 - LPD Helix Nuts and Bolts file
 - LRC Intel Video Phone file
 - LST List file
 - LWO Lightwave Object file
 - LWP Lotus Wordpro 96/97 file
 - LZH LH ARC compressed archive
 - LZS Skyroads data file
 - M3D Corel Motion 3D animation
 - MAC MacPaint image
 - MAD Microsoft Access module
 - MAF Microsoft Access Form
 - MAK Visual Basic or MS Visual C++ Project
 - MAM Microsoft Access Macro
 - MAP Map file
 - MAP Duke Nukem 3D WAD game file
 - MAQ Microsoft Access Query
 - MAR Microsoft Access Report
 - MAS Lotus Freelance Graphics Smartmaster file
 - MAT Microsoft Access Table
 - MAX Paperport file
 - MAZ Hover maze data
 - MB1 Apogee Monster Bash data file
 - MCC Dialer10 calling card
 - MCS MathCAD image
 - MCW Microsoft Word for Macintosh document
 - MDA Microsoft Access add-in
 - MDB Microsoft Access database
 - MDE Microsoft Access MDE file
 - MDL Digital Tracker music module (MOD) file
 - MDL Quake model file
 - MDN Microsoft Access blank database template
 - MDW Microsoft Access Workgroup
 - MDZ Microsoft Access wizard template
 - MED Music Editor, OctaMED music module (MOD) file
 - MER Format for interchanging spreadsheet/database data; recognized by Filemaker, Excel, and others
 - MET Presentation Manager metafile
 - MI Miscellaneous
 - MIC Microsoft Image Composer file
 - MID MIDI music
 - MMF Microsoft Mail File
 - MMM Microsoft Multimedia Movie
 - MOD FastTracker, StarTrekker, Noise Tracker (etc.) music module file
 - MOD Microsoft Multiplan spreadsheet
 - MOV QuickTime for Windows movie
 - MPE MPEG animation
 - MPEG MPEG animation
 - MPG MPEG animation
 - MPP Microsoft Project file
 - MPP CAD drawing file format
 - MP3 MPEG Audio Layer 3 (AC3) file
 - MSG Microsoft Mail message
 - MSN Microsoft Network document
 - MSP Microsoft Paint bitmap
 - MTM MultiTracker music module (MOD) file
 - MUS Music
 - MVB Microsoft Multimedia Viewer file
 - MWP Lotus Wordpro 97 Smartmaster file
 - NAP NAP Metafile
 - NCB Microsoft Developer Studio file
 - NSF Lotus Notes database
 - NST Noise Tracker music module (MOD) file
 - NTF Lotus Notes database template
 - OBD Microsoft Office binder template
 - OBD Microsoft Office Binder
 - OBJ Object file
 - OBZ Microsoft Office Binder Wizard
 - OCX Microsoft Object Linking and Embedding custom control
 - OFN Microsoft Office FileNew file
 - OFT Microsoft Outlook template
 - OKT Oktalyzer music module (MOD) file
 - OLB OLE Object Library
 - OLE OLE object
 - OPT Microsoft Developer Studio file
 - ORG Lotus Organiser file
 - OR2 Lotus Organiser 2 file
 - OR3 Lotus Organiser 97 file
 - P10 Tektronix Plot 10 drawing
 - PAB Microsoft Personal Address Book
 - PAK Quake WAD file
 - PAL Windows colour palette
 - PAT Corel Draw pattern
 - PBK Microsoft Phonebook
 - PBM Portable Bitmap
 - PCD Kodak Photo-CD image
 - PCL HP Laserjet bitmap
 - PCS PICS animation
 - PCT Macintosh PICT drawing
 - PCX ZSoft PC Paintbrush bitmap
 - PDF Adobe Acrobat Portable Document Format or Netware Printer Definition File
 - PDF Package Definition File from Microsoft Systems Management Server
 - PDQ Patton&Patton Flowcharting PDQ Lite file
 - PFA Type 1 font (ASCII)
 - PFB Type 1 font (binary)
 - PFC PF Component
 - PFM Printer Font Metrics
 - PGL HP Plotter drawing
 - PGM Portable Graymap (bitmap)
 - PIC PC Paint bitmap
 - PIC Lotus picture
 - PIC Macintosh PICT drawing
 - PIF Program Information File
 - PIF IBM PIF drawing
 - PIG Lucas Arts Dark Forces WAD file
 - PIN Epic Pinball data file
 - PIN Epic Pinball data file
 - PIX Inset Systems bitmap
 - PJ MKS Source Integrity file
 - PKG Microsoft Developer Studio application extension (similar to a DLL file)
 - PL Perl program
 - PLT HPGL Plotter drawing
 - PLT AutoCAD Plot drawing
 - PM5 Pagemaker 5.0 file
 - PM6 Pagemaker 6.0 file
 - P65 Pagemaker 6.5 file
 - PNG Portable Network Graphics bitmap
 - PNG Paint Shop Pro Browser catalogue
 - PNT MacPaint graphic file
 - POT Microsoft PowerPoint Template
 - PP4 Picture Publisher 4 bitmap
 - PPA Microsoft PowerPoint Add-in
 - PPM Portable Pixelmap bitmap
 - PPS Microsoft PowerPoint slide show
 - PPT Microsoft PowerPoint presentation
 - PRE Lotus Freelance presentation
 - PRF Windows system file
 - PRN Print Table (space delimited text)
 - PRS Harvard Graphics for Windows presentation
 - PRZ Lotus Freelance Graphics 97 file
 - PS Postscript Interpreted drawing
 - PSD Adobe Photoshop bitmap
 - PST Microsoft Outlook Personal Folder File
 - PTM Polytracker music module (MOD) file
 - PUB Ventura Publisher publication
 - PUB Microsoft Publisher document
 - PWD Microsoft Pocket Word document
 - PWZ Microsoft PowerPoint Wizard
 - PXL Microsoft Pocket Excel spreadsheet
 - QAD PF QuickArt Document
 - QBW QuickBooks for Windows file
 - QDT Quick Books data file from the Quicken UK Accountancy/Tax/Invoice program
 - QLB Quick Library
 - QRY Microsoft Query
 - QT QuickTime Movie
 - QTM QuickTime Movie
 - QXD Quark XPress file
 - R Pegasus Mail resource file
 - RA Real Audio sound
 - RAM Real Audio sound
 - RAS Sun Raster Images bitmap
 - RAW Raw File Format (bitmap)
 - RC Microsoft Visual C++ Resource Script
 - REC Recorder macro
 - REG Registration file
 - RES Microsoft Visual C++ Resource
 - RFT RFT-DCA
 - RLE Run-Length Encoded bitmap
 - RM Real Audio video file
 - RMI MIDI music
 - ROV Rescue Rover data file
 - RPT Microsoft Visual Basic Crystal Reports file
 - RTF Rich Text Format document
 - RTM Real Tracker music module (MOD) file
 - SAM Ami Professional document
 - SAV Saved game file
 - SCC Microsoft Source Safe file
 - SCD Matrix/Imapro SCODL slide image
 - SCD Microsoft Schedule+ 7
 - SCH Microsoft Schedule+ 1
 - SCN trueSpace2 scene
 - SCP Dial-Up Networking Script
 - SCR Windows screensaver
 - SCR Fax image
 - SCT Scitex CT bitmap
 - SC2 Microsoft Schedule+ 7
 - SDL SmartDraw library
 - SDR SmartDraw drawing
 - SDT SmartDraw template
 - SEA Self-expanding archive (used by Stuffit for Mac files and possibly by others)
 - SEP Tagged Image File Format (TIFF) bitmap
 - SHB Corel Show presentation
 - SHB Document shortcut file
 - SHG Hotspot bitmap
 - SHS Shell scrap file
 - SHW Corel Show presentation
 - SIT Stuffit archive of Mac files
 - SLK Symbolic Link (SYLK) spreadsheet
 - SND NeXT sound
 - SND Mac Sound Resource
 - SQC Structured Query Language (SQR) common code file
 - SQR Structured Query Language (SQR) program file
 - STM Scream Tracker music module (MOD) file
 - STY Ventura Publisher style sheet
 - SVX Amiga 8SVX sound
 - SYS System file
 - S3M Scream Tracker 3 music module (MOD) file
 - TAR Tape Archive
 - TAZ Unix Gzip/Tape Archive
 - TEX Texture file
 - TGA Targa bitmap
 - TGZ Unix Gzip/Tape Archive
 - THEME Windows 95 Desktop Theme
 - THN Graphics Workshop for Windows thumbnail
 - TIF Tag Image File Format (TIFF) bitmap
 - TIFF Tag Image File Format (TIFF) bitmap
 - TIG Tiger file, used by US government to distribute maps
 - TLB OLE Type Library
 - TMP Windows temporary file
 - TRM Terminal file
 - TRN MKS Source Integrity project usage log
 - TTF TrueType font
 - TWF TabWorks file
 - TWW Tagwrite Template
 - TX8 MS-DOS Text
 - TXT Text
 - T2T Sonata CAD modelling software file
 - UDF Windows NT Uniqueness Database File
 - ULT Ultratracker music module (MOD) file
 - URL Internet shortcut
 - USE MKS Source Integrity file
 - VBP Visual Basic Project
 - VBW Microsoft Visual Basic workspace
 - VBX Visual Basic custom control
 - VCF Vevi Configuration File; defines objects for use with Sense8's WorldToolKit
 - VDA Targa bitmap
 - VI Virtual Instrument file from National Instruments LABView product
 - VLB Corel Ventura Library
 - VOC Creative Labs Sound Blaster sound
 - VP Ventura Publisher publication
 - VSD Visio drawing (flow chart or schematic)
 - VST Targa bitmap
 - VSW Visio Workspace file
 - VXD Microsoft Windows virtual device driver
 - WAD Large file for Doom game containing video, player level, and other information
 - WAV Windows Waveform sound
 - WB1 QuattroPro for Windows spreadsheet
 - WB2 QuattroPro for Windows spreadsheet
 - WBK Microsoft Word Backup
 - WBL Argo WebLoad II upload file
 - WCM WordPerfect Macro
 - WDB Microsoft Works database
 - WEB CorelXara Web document
 - WGP Wild Board Games data file
 - WID Ventura width table
 - WIL WinImage file
 - WIZ Microsoft Word Wizard
 - WK1 Lotus 123 versions 1 & 2 spreadsheet
 - WK3 Lotus 123 version 3 spreadsheet
 - WK4 Lotus 123 version 4 spreadsheet
 - WKS Lotus 123 Worksheet spreadsheet
 - WKS Microsoft Works document
 - WLF Argo WebLoad I upload file
 - WLL Microsoft Word Add-In
 - WMF Windows Metafile
 - WOW Grave Composer music module (MOD) file
 - WP WordPerfect document
 - WPW Novel PerfectWorks document
 - WP4 WordPerfect 4 document
 - WP5 WordPerfect 5 document
 - WP6 WordPerfect 6 document
 - WPD WordPerfect Demo
 - WPD WordPerfect Document
 - WPG WordPerfect Graphic
 - WPS Microsoft Works document
 - WPT WordPerfect Template
 - WQ1 QuattroPro/DOS spreadsheet
 - WQ2 QuattroPro/DOS version 5 spreadsheet
 - WRI Write document
 - WRL Virtual Reality model
 - WS1 WordStar for Windows 1 document
 - WS2 WordStar for Windows 2 document
 - WS3 WordStar for Windows 3 document
 - WS4 WordStar for Windows 4 document
 - WS5 WordStar for Windows 5 document
 - WS6 WordStar for Windows 6 document
 - WS7 WordStar for Windows 7 document
 - WSD WordStar 2000 document
 - WVL Wavelet Compressed Bitmap
 - XAR Corel Xara drawing
 - XLA Microsoft Excel add-in
 - XLB Microsoft Excel toolbar
 - XLC Microsoft Excel chart
 - XLD Microsoft Excel dialogue
 - XLK Microsoft Excel backup
 - XLM Microsoft Excel macro
 - XLS Microsoft Excel worksheet
 - XLT Microsoft Excel template
 - XLV Microsoft Excel VBA module
 - XLW Microsoft Excel workbook / workspace
 - XM FastTracker 2, Digital Tracker music module (MOD) file
 - XR1 Epic MegaGames Xargon data file
 - XTP XTree data file
 - XY3 XYWrite III document
 - XY4 XYWrite IV document
 - XYP XYWrite III Plus document
 - XYW XYWrite for Windows 4.0 document
 - YAL Arts & Letters clipart library
 - YBK Microsoft Encarta Yearbook
 - Z Unix Gzip
 - ZIP Zip file
 - ZOO An early compressed file format
 - 000-999 Used to number old versions of files and number related data files
 - 12M Lotus 123 97 Smartmaster file
 - 123 Lotus 123 97 file
 - 2GR and 3GR VGA Graphics driver/configuration files under Windows
 - 386 A file for use in an 80386 or higher microprocessor
 - 669 Composer 669, Unis Composer music mod file
 - #01 and higher A method of numbering picture files for a roll of film that has been scanned
 - $$$ Used by OS/2 to keep track of archived files
 - @@@ Screen files used in the installation and instruction on use of applications
 
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