| Home (Frames) | Home (Noframes) |
| Ext | Description | Goto Shareware |
| .!!! | Usually Readme file Notepad | |
| .### | DoubleSpace compressed volume file | |
| .### | QTIC temp file | |
| .#24 | LocoScript printer data file for 24 pin matrix printer | |
| .#GF | MetaFont font file | |
| .#IB | LocoScript printer data file | |
| .#SC | LocoScript printer data file | |
| .#ST | LocoScript standard mode printer definitions | |
| .$$$ | Often used as backup file | |
| .$$$ | Temporary file | |
| .$$F | OS/2 database | |
| .$$P | OS/2 notes | |
| .$$S | OS/2 spreadsheet | |
| .$00 | DOS pipe file | |
| .$1 | ZX Spectrum file in HOBETA format | |
| .$D$ | OS/2 Planner data | |
| .$DB | dBASE Temporary file | |
| .$ED | Ms C editor temporary file | |
| .$LN | Borland C++ TLink response file | |
| .$OL | DOS pipe file | |
| .$VM | Windows 3.x Virtual Manager temporary file | |
| .&&& | Temporary file | |
| .)2( | LHA archiver temporary file | |
| .--- | Often used as backup file | |
| .0 | DoubleSpace compressed harddisk data | |
| .000 | Often used as backup file | |
| .000 | DoubleSpace compressed harddisk data | |
| .000 | GEOS common filename extension | |
| .001 | Often used as backup file | |
| .001 | Hayes JT FAX fax (many) | |
| .075 | Ventura Publisher 75x75 dpi font | |
| .085 | Ventura Publisher 85x85 dpi font | |
| .091 | Ventura Publisher 91x91 dpi font | |
| .096 | Ventura Publisher 96x96 dpi font | |
| .0B | PageMaker printer font with lineDraw extended character set | |
| .1 | Unformatted manual page (Roff/nroff/troff/groff) | |
| .10X | Gemini 10x printer bitmap graphics file | |
| .123 | Lotus 123 97 data | |
| .12M | Lotus 123 97 smartmaster file | |
| .15U | PageMaker printer font with PI font set | |
| .1ST | Usually as 'Readme.1st' a textfile Notepad | |
| .24B | 24B bitmap image | |
| .286 | Virtual device driver (Windows standard mode) | |
| .2GR | 286 GRabber file | |
| .301 | Brook Trout image | SB |
| .301 | Fax (Super FAX 2000 - Fax-Mail 96) | |
| .386 | Virtual device driver (Windows 386 enhanced mode) | |
| .3D | Atari Stereo CAD-3D objects graphics format | |
| .3D2 | Atari Stereo CAD-3D 2.0 objects graphics format | PT |
| .3D4 | Atari Stereo CAD-3D objects graphics format | |
| .3DF | Quickdraw 3D file | PT |
| .3DM | Quickdraw 3D metafile | PT |
| .3DMF | 3D MetaFile for Quickdraw 3D (MacOS) | Win & Mac: QT |
| .3DS | Autodesk 3D Studio 3D scene | AT, PT |
| .3DT | Database in which the meta-data of a 3D Topicscape is held | 3DT |
| .3FX | CorelChart 3D effects | |
| .3GR | 386 GRabber file | |
| .3T4 | Util3 binary file converter to ascii | |
| .411 | Mavica digital camera bitmap image | |
| .4C$ | 4Cast/2 datafile | |
| .4GE | Informix 4GL compiled source code | |
| .4GL | Informix 4GL language source code file | |
| .4MD | Music file | |
| .4SW | 4DOS SWap File | |
| .4TH | Forth source code | |
| .668 | Music (mixing always at 12048Hz) | |
| .669 | 669 Composer music (8 channels MOD) | |
| .6CM | Triton FastTracker music (6 Channel Module) | |
| .75 | Ventura Publisher 75x75 dpi display font | |
| .777 | 777 compressed file archive | |
| .8 | A86 assembly language source code file | |
| .85 | Ventura Publisher 85x85 dpi display font | |
| .8BA | Adobe PhotoShop Import | |
| .8BE | Adobe PhotoShop Export Plugin | |
| .8BF | Adobe PhotoShop Filter Plugins (also Adobe Photodelux) | |
| .8BI8 | Adobe PhotoShop Plugin Format | |
| .8BL | Adobe PhotoShop Plugin Format | |
| .8BP | Adobe PhotoShop Import | |
| .8BX | Adobe PhotoShop Plugin Extension | |
| .8CM | Triton FastTracker music (8 Channel Module) | |
| .8M | Math 8 extended character set printer font (PageMaker) | |
| .8MED | Amiga OctaMed music | |
| .8SVX | Amiga 8-bit sound | |
| .8U | Roman 8 extended character set printer font (PageMaker) | |
| .91 | Ventura Publisher 91x91 dpi display font | |
| .96 | Ventura Publisher 96x96 dpi display font | |
| .??_ | Ms Compress archive | WZ |
| .??$ | see .??_ | |
| .@@@ | Screen files used in installation or instructions | |
 Up | ||
| Ext | Description | Goto Shareware |
| .A | Ada source code | |
| .A | Assembly source code (Macintosh) | |
| .A | Object library (Unix) | |
| .A01 | ARJ multiple disk archive, disk 2 | |
| .A02 | ARJ multiple disk archive, disk 3 | |
| .A03 | ARJ multiple disk archive, disk 4 | |
| .A04 | ARJ multiple disk archive, disk 5, etc. | |
| .A11 | AIIM image | |
| .A31 | Authorware 3.x library | |
| .A3M | Unpackaged file (Authorware for Macintosh) | |
| .A3W | Unpackaged file (Authorware for Windows) | |
| .A41 | Authorware 4.x library | |
| .A4M | Unpackaged file (Authorware for Macintosh) | |
| .A4P | Package without runtime (Authorware) | |
| .A4W | Unpackaged file (Authorware for Windows) | |
| .A51 | Authorware 5.x library | |
| .A5W | Unpackaged file (Authorware for Windows) | |
| .A8 | Cubicomp PictureMaker alpha channel image data (24bit 3D animation) | |
| .A86 | A86 assembly language source code file | |
| .AAC | Homeboy reference (music) | |
| .AAM | Authorware Shocked file | |
| .AAS | Authorware Shocked packet | |
| .AB6 | ABStat datafile | |
| .AB8 | ABStat datafile | |
| .ABC | Athena 16 addressbook | |
| .ABC | ABC FlowCharter 1.0 document | |
| .ABC | ABC programming language general filename extension | |
| .ABC | Musical notation language file (folk melodies) | |
| .ABF | Adobe Glyph Bitmap Distribution Format stores Adobe screen fonts as binary | |
| .ABK | CorelDRAW Automatic BacKup | |
| .ABK | Avigo backup | |
| .ABM | AlBuM (Image PALS, PhotoPlus) | |
| .ABR | Adobe Photoshop Brush | |
| .ABS | MPEG sound Mime: audio/x-mpeg | |
| .ABS | Abstracts (info file) | |
| .ABS | Abscissa data file | |
| .AC$ | Spooled plot file (AutoCAD AutoSpool) | |
| .ACA | Project Manager Workbench project | |
| .ACAD | AutoCAD database file | |
| .ACB | Compressed file archive | |
| .ACB | ACMB graphics | |
| .ACC | Program (DR-DOS - ViewMax) (GEM / resident) | |
| .ACD | Audio (Sonic Foundry ACID bundle file) | |
| .ACE | Archive | WC |
| .ACF | Adobe Custom Filter for PhotoShop | |
| .ACGI | ACGI Script (WWW) | |
| .ACL | Corel Draw 6 keyboard ACceLerator | |
| .ACM | Audio Compression Module add-on to MSACM.DRV Windows driver (dynamic link library) | |
| .ACM | Graphics file (ACMB format) | |
| .ACMB | Graphics file (ACMB format) | |
| .ACO | Adobe COlor palette | |
| .ACP | Ms Office Assistant preview file | |
| .ACP | Compressed file archive (ACB) | |
| .ACR | Bitmap image (American Collage of Radiology ACR-NEMA medical image file) | |
| .ACR | DICOM/ACR image | IV |
| .ACT | FoxPro Foxdoc ACTion Diagrams | |
| .ACT | ACTor source code file (Graphics cell) (Animation Works) | |
| .ACT | MS Office Assistant ACTor | |
| .ACT | Adobe Photoshop color table | |
| .ACT | Action! presentation | |
| .ACV | Adobe Photoshop colour curves file | |
| .ACV | Compress and decompress audio data (OS/2 driver) | |
| .AD | AfterDark screensaver | |
| .AD2 | ADPCM 2-bit compressed voice file (ZFAX) | |
| .AD3 | ADPCM 3-bit compressed voice file (ZFAX) | |
| .ADA | Ada source code | |
| .ADB | Ada Package Body | |
| .ADB | Appointment DataBase (HP 100LX organizer) | |
| .ADC | Scanstudio bitmap image | |
| .ADC | Lingvo dictionary | |
| .ADC | Sound (TI/MIT ADC format) | |
| .ADD | Adapter Device Driver (OS/2) | |
| .ADEX | ADEX Corp. bitmap image | |
| .ADF | Administration configuration file | |
| .ADF | Amiga Disk File Gzip | |
| .ADI | AutoCAD Device-Independent binary plotter format | |
| .ADL | MicroChannel Adapter Description Library file | |
| .ADM | SCSI driver? | |
| .ADM | After Dark MultiModule screensaver | |
| .ADM | ADMinistrator policy template (Windows NT) | |
| .ADN | Lotus 123 ADd-iN | |
| .ADO | Adobe PhotoShop Duotone | |
| .ADP | Astound Dynamite file | |
| .ADP | FaxWorks setup file for fax modem interaction | |
| .ADPCM | Sound (Intel/DVI Adaptive Differential Pulse Code Modulation format) | |
| .ADR | After Dark Randomizer screensaver | |
| .ADR | Smart Address ADdRess book | |
| .ADS | ADa package Specification | |
| .ADT | AdTech fax | |
| .ADT | HP NewWave datafile for cardfile application | |
| .ADT | Lingvo dictionary | |
| .ADV | GUS device driver (Gf166.com) | |
| .ADX | Lotus Approach dBASE index | |
| .ADX | Archetype Designer document | |
| .ADZ | Amiga Disk File (.ADF) in gzip format Gzip | |
| .AEX | Alpha linked executable file | |
| .AEX | PGP Armored Extracted Public Key | |
| .AEXPK | PGP Armored Extracted Public Key | |
| .AF2 | ABC FlowCharter 2.0 flowchart | |
| .AF3 | ABC FlowCharter 3.0 flowchart | |
| .AFC | Apple sound | GW |
| .AFI | Truevision bitmap image | |
| .AFL | Lotus Allways font file | |
| .AFL | RubberFlex animation (AnimaFlex) | |
| .AFM | Adobe Font Metrics Notepad | |
| .AFM | HP NewWave datafile for cardfile application | |
| .AFP | ABC FlowCharter shape palette | |
| .AFT | ABC FlowCharter 3.0 template | |
| .AFW | ABC FlowCharter 3.0 workspace | |
| .AG | Lotus AGenda File | |
| .AGF | Atlas Geo File (ESRI GIS & Mapping software) Here you'll find a .SHP to .AGF (and backwards) converter | |
| .AGN | Psion Series 3 AGeNda | |
| .AI | Adobe Illustrator vector image, subset of .EPS. Also used by Corel-TRACE Mime: application/postscript | |
| .AIF | Audio Interchange File Format from Apple/SGI, see AIFF | |
| .AIF | EPOC Application Information File | |
| .AIF | ADW Knowledge Ware setup information | |
| .AIFC | Audio Interchange File Format with Compression (AIFF-C) sound from Apple/SGI | AV |
| .AIFF | Audio Interchange File Format from Apple/SGI Media Player Mime: audio/aiff Mime(2): audio/x-aiff | AV, CMW, GW, IV, QVP Win & Mac: QT |
| .AIM | AOL Instant Message launch | |
| .AIM | Asm Text Mode Image File (The Ultimate Draw) | |
| .AIN | Ain compressed file archive | |
| .AIO | APL file transfer format file | |
| .AIP | Adobe Illustrator Extension, Tool or Filter | |
| .AIP | Audiosoft parameter file | |
| .AIR | Automatic Image Registration | |
| .AIS | ACDSee Image Sequence | |
| .AIS | Xerox graphics (Array of Intensity Samples) | |
| .AIS | Velvet Studio Instruments | |
| .AIX | HP NewWave datafile for cardfile application | |
| .AKW | A-KeyWords (RoboHELP Help project Index Designer) | |
| .AL | ALAW format sound | |
| .ALAW | ALAW format sound | |
| .ALB | JASC Image Commander graphics ALBum | |
| .ALG | ARCSOLO Activity LoG | |
| .ALIAS | ALiaS bitmap image (24bit RGB RLE), see .ALS | |
| .ALL | WordPerfect general printer info | |
| .ALL | Arts & Letters Library (Symbol and font files) | |
| .ALL | FRQView filelist of all files | |
| .ALL | Always format file for working pages | |
| .ALO | Almanac support file | |
| .ALPHA | Bitmap image (raw alpha bytes) | |
| .ALS | Bitmap image (24bit RLE) (Alias/Vivid RayTracer) | Various: XNV |
| .ALT | WordPerfect menu file | |
| .AMC | Advanced MP3 Catalog file | |
| .AMF | Advanced Module Format music | |
| .AMG | AMGC compressed file archive | |
| .AMG | Actor system image file | |
| .AMS | Adobe Monitor Setup calibration file for PhotoShop | |
| .AMS | Velvert Studio MOD MUSIC | |
| .AMZ | Savegame extension for 'The Game of the Amazons' | |
| .ANC | List of pattern colors (Canon Computer Pattern Maker) | |
| .ANI | Windows 95/NT animated cursor | IV |
| .ANI | Animation (Presidio - many) | |
| .ANM | ANiMation from DeluxePaint, often used on Amiga | |
| .ANN | Windows 3.x help ANNotations | |
| .ANS | ANSI-textNotepad | |
| .ANT | SimAnt saved game data | |
| .AOL | America On-Line related file | |
| .AOS | Installable program (Nokia Communicator add-on software) | |
| .AP | Whap compressed Amiga file archive | |
| .AP | Datalex EntryPoint 90 datafile | |
| .APC | Lotus printer driver characters | |
| .APD | Lotus printer driver | |
| .APD | Aldus PageMaker Printer description | |
| .APF | Lotus printer driver fonts | |
| .API | Lotus printer driver | |
| .API | Adobe Printer Ink file for PhotoShop | |
| .API | Adobe Acrobat Application Program Interface file | |
| .API | 1st Reader passed parameter file | |
| .APL | Manugraphics APL products work space | |
| .APP | FoxPro generated APPlication | |
| .APP | Symphony add-in APPlication | |
| .APP | APPlication object file by dBASE Application Generator | |
| .APP | Executable APPlication file (DR-DOS/NeXTstep/Atari/EPOC) | |
| .APR | Lotus APpRoach view | |
| .APR | Employee Appraiser performance review | |
| .APS | MS Visual C++ data | |
| .APT | Lotus Approach data and views | |
| .APX | Lotus Approach-specific Paradox information | |
| .APX | Borland C++ APpeXpert database | |
| .AQL | America On-line for Windows DLL | |
| .ARC | An older archive format May be manipulated by several programs like Arc, Arce, Pkxarc or Pkunpak | SE, WZ |
| .ARC | Ms Schedule+ 1.0 file | |
| .ARF | Automatic Response File | |
| .ARH | Archivers definitions file (DN) | |
| .ARI | Aristotle audio | |
| .ARI | ARI compressed file archive | |
| .ARJ | Robert Jung's ARJ compressed file archive Arj.exe | FMV, SE, WC, WZ |
| .ARK | ARC archive (CP/M port of ARC file archiver) | |
| .ARK | Managing your Money achive | |
| .ARK | QUARK compressed file archive | |
| .ARR | Atari Cubase ARRangement | |
| .ARR | Amber ARR bitmap image | |
| .ART | America Online image Internet Explorer | |
| .ART | PFS: First Publisher image | GWS |
| .ART | Art Director image | Various: XNV |
| .ART | Another Ray Tracer image | |
| .ART | Xara Studio image | |
| .ART | Vort image | |
| .ARX | Compressed archive | |
| .AS | AudioSoft file | WA |
| .ASA | Ms Visual InterDev data | |
| .ASC | ASCii-text (ASCII=American Standard Code for Information Interchange), see also .TXT Notepad | DC, QV |
| .ASC | PGP (Pretty Good Privacy) transport armored file | |
| .ASC | Autodesk 3D Studio 3D object, saved as ASCII | AT, PT |
| .ASD | Word for Windows autosave file | |
| .ASD | Lotus screen driver | |
| .ASD | Advanced Streaming format (ASF) Description file | |
| .ASD | Astound presentation | |
| .ASE | Velvet Studio sample | |
| .ASF | Audio (Video?) (Advanced Streaming Format File) MediaPlayer Mime: video/x-ms-asf | AV, IV |
| .ASF | STATGRAPHICS datafile | |
| .ASF | Lotus screen font | |
| .ASH | TASM ASsembly Header | |
| .ASI | Turbo/Borland C++ ASsembler Include file | |
| .ASIC | ASIC language source code file | |
| .ASM | ASseMbler source Notepad | MV |
| .ASO | Turbo Assembler ASsembler Object | |
| .ASO | Astound Dynamite Objects | |
| .ASP | Active Server Pages: dynamic HTML page | |
| .ASP | ASP (Association of Shareware Professionals) text | |
| .ASP | Procomm Plus ASPect language script file | |
| .AST | Adobe color Separtion Table for PhotoShop | |
| .AST | Claris Works assistant file | |
| .AST | Astound multimedia file | |
| .ASV | DataCAD AutoSaVe | |
| .ASX | Audio (Video?) (Advanced Streaming Redirector File) MediaPlayer Mime: video/x-ms-asf | AV |
| .ASX | Cheyenne Backup script | |
| .AT2 | Aldus Persuasion 2.0 Auto Template | |
| .ATK | Bitmap image (Andrew Toolkit Raster Object file) | |
| .ATM | TerraGen ATMosphere (landscape renderer) | |
| .ATM | Adobe Type Manager related file | |
| .ATMSPHR | TerraGen ATMoSPHeRe (landscape renderer) | |
| .ATT | AT&T Group 4 bitmap graphics | |
| .ATW | Personal data (AnyTime Deluxe for Windows screensaver) | |
| .ATY | A file produced when an association type is exported by 3D Topicscape. (Used for a round-trip re-import) | 3DT |
| .AU | Sound Sun/NeXT/DEC Media Player Mime: audio/basic | AV, CMW, GW, IV, QVP Win & Mac: QT |
| .AUT | IPIX automation | |
| .AUX | ChiWriter AUXiliary dictionary | |
| .AUX | TeX/LaTeX AUXiliary references | |
| .AVA | Avagio publication | |
| .AVB | AntiViral Toolkit Pro Bases | |
| .AVC | AVP (virus scanner) antiviral database | |
| .AVI | Video for Windows Audio Video Interleave movie Media Player Mime: video/msvideo Mime(2): video/x-msvideo Mime(3): video/avi | AV, CMW, FMV, GWS, IV, TP Win & Mac: QT |
| .AVR | Audio Visual Research sound | |
| .AVS | Stardent AVS X bitmap image | IM Various: XNV |
| .AVS | Application Visualization System animation | |
| .AVS | Winamp Advanced Visualization Studio File | WA |
| .AVT | Avatar-coding files (A3E) | |
| .AW | HP AdvanceWrite document | |
| .AWA | Animation Works Accelerated movie | |
| .AWD | Faxdocument (FaxView - Microsoft Fax At Work) Imaging | |
| .AWD | AWarD bios file | |
| .AWD | AWK language source code file | |
| .AWM | Animation Works Movie | |
| .AWR | Telsis digitally stored audio | |
| .AWS | STATGRAPHICS data | |
| .AWX | Custom application wizard | |
| .AX | Modula-3 linker information for libraries | |
| .AYS | AY Paste 'Paste' file | |
| .AYU | AY-Paste Uninstall information Notepad | |
| .AZZ | AZZ Cardfile, which is a replacement for Microsoft's Cardfile.exe | |
| Up | ||
| Ext | Description | Goto Shareware |
| .B | Basic language source code file | |
| .B | Modula-3 base program | |
| .B | APPLAUSE Batch list | |
| .B&W | Black & White bitmap image (atari - mac) | |
| .B&W | 1st Reader bitmap image (mono binary screen image) | |
| .B1N | 1st Reader bitmap image (both mono and color binary screen image) | |
| .B30 | Printer font (JLaser - Cordata) (Ventura Publisher) | |
| .B4 | Helix Nuts and Bolts file | |
| .B64 | StuffItEncoded encoded file archive (ascii) (base64 MIME) | PKZ, WC, WZ |
| .B8 | PicLab bitmap image (one byte per pixel) plane two | |
| .B8 | Cubicomp PictureMaker red channel image data (24bit 3D animation) | |
| .B_W | Black & White bitmap image (atari - mac) | |
| .BAC | BACkup | |
| .BAD | BAD file | |
| .BAK | Often used as BAcKup file. You may try WhatFormat to help to figure out what formats they have. | |
| .BAL | Ballade music score | |
| .BAR | Unix BAR compressed file archive | |
| .BAR | dBASE Application Generator horizontal bar menu object file | |
| .BAS | Basic source. Often readable with Notepad | MV |
| .BAT | MS-DOS batch file (Executable) Notepad | MV |
| .BB | Papyrus database backup | |
| .BBL | TeX/BibTeX BiBLiographic reference | |
| .BBM | Deluxe Paint bitmap image, used for animations | |
| .BBNNG | Bitmap image (BBN BitGraph terminal Display Pixel Data (DPD) sequence) | |
| .BBP | Bezier surface file | |
| .BBS | Text from Bulletin Board System | |
| .BBS | Hudson-style messagebase (FTN software) | |
| .BCH | dBASE BatCH process object file | |
| .BCH | Datalex EntryPoint 90 datafile | |
| .BCK | VMS/VAX BaCKup | |
| .BCM | Ms Works Communications script backup | |
| .BCO | Bitstream outline font description | |
| .BCP | Borland C++ makefile | |
| .BCS | Windows95 browse information | |
| .BCT | Clarion backup dictionary | |
| .BCW | Borland C++ 4.5 workspace (Environment settings) | |
| .BDB | Ms Works database backup | |
| .BDC | Lingvo dictionary | |
| .BDF | Adobe Glyph Bitmap Distribution Format stores Adobe screen fonts as ASCII | |
| .BDF | NuGraf Scene file | PT |
| .BDF | BUpdate binary update file | |
| .BDF | Egret datafile | |
| .BDR | Ms Publisher BorDeR | |
| .BDT | Lingvo dictionary | |
| .BEX | PGP Binary EXtracted public key | |
| .BEXPK | PGP Binary EXtracted Public Key | |
| .BEZ | Bezier surface file | |
| .BEZ | Bitstream outline font description | |
| .BF2 | Bradford 2 font | |
| .BFC | Windows 95 BrieFCase | |
| .BFF | WorldToolKit Neutral File Format (binary) used for virtual reality | |
| .BFM | Font metrics (unix/Frame) | |
| .BFX | BitFaX fax | |
| .BG | Lotus Agenda File | |
| .BG | Backgammon for Windows game | |
| .BGA | OS/2 graphic array, Ms Paint, variation on .BMP, see .BMP | |
| .BGI | Borland Graphics Interface (Device driver for graphical adapters) | |
| .BHX | BinHex compressed file ascii archive | |
| .BI | Visual Basic for DOS Include file | |
| .BIB | BIBliography (ASCII) | |
| .BIB | Papyrus database - not compatible with TeX format | |
| .BIB | ||
| .BIF | Binary Information File (ASCII file describing image) | |
| .BIF | Image Capture board bitmap image (b&w Binary Image Format) | |
| .BIF | GroupWise initialization file | |
| .BIFF | XLITE 3D file | |
| .BIG | Chinese text (old version) | |
| .BIG5 | Chinese text (old version) | |
| .BIL | Satellite image (8bit GIS tape format) (SPOT image) | |
| .BIN | (BINair) machine language Mime: application/octet-stream | |
| .BIN | MacBinary archive format often used on Macintosh | SE Mac: SE |
| .BIN | SGI Powerflip | |
| .BIO | OS/2 BIOs | |
| .BIT | X11 bitmap image | |
| .BIX | BIX compressed file archive | |
| .BK | BacKup file | |
| .BK | JetFax faxbook | |
| .BK! | WordPerfect for Win document backup | |
| .BK1 | WordPerfect for Win timed backup file for document window 1 | |
| .BK2 | WordPerfect for Win timed backup file for document window 2 | |
| .BK3 | WordPerfect for Win timed backup file for document window 3 | |
| .BK4 | WordPerfect for Win timed backup file for document window 4 | |
| .BK5 | WordPerfect for Win timed backup file for document window 5 | |
| .BK6 | WordPerfect for Win timed backup file for document window 6 | |
| .BK7 | WordPerfect for Win timed backup file for document window 7 | |
| .BK8 | WordPerfect for Win timed backup file for document window 8 | |
| .BK9 | WordPerfect for Win timed backup file for document window 9 | |
| .BKI | IBM BookManager BacKup Index | |
| .BKP | Write/TurboVidion DialogDesigner BacKuP file | |
| .BKS | Ms Works spreadsheet backup | |
| .BKS | IBM BookManager BooKSelf | |
| .BKW | FontEdit mirror image of font set | |
| .BLD | Basic BLoaDable image | |
| .BLG | ARCSOLO Backup LoG | |
| .BLG | BibTex log | |
| .BLK | Amiga IFF ILBM image, see IFF | |
| .BLK | WordPerfect temporary file | |
| .BM | X Windows system BitMap image, see XBM | |
| .BM1 | Apogee BioMenace game data | |
| .BMF | Corel Gallery file | TP |
| .BMF | Corel graphics (Binary Material Format) | |
| .BMK | BookMarK file belonging to Windows help | |
| .BMP | BitMaP image, OS/2 or Windows, RLE compressed or uncompressed. Standard bitmap-format for Windows, the OS/2 version is slightly different Paint, Paintbrush, Imaging Mime: image/x-MS-bmp | ACD, FMV, GWS, IM, IV, JIR, LVP, PSP, PP, PV, QV, QVP, SB, TP, TVP Mac: GC Win & Mac: QT Various: XNV |
| .BMT | Ami Pro button image | |
| .BMW | BuzzPlay music | |
| .BNK | Adlib instrument BaNK | |
| .BNR | Banner - Poster graphics BaNneR | |
| .BOB | BOB bitmap image | |
| .BOO | Encoded file archive (ASCII) (Boo) | |
| .BOO | IBM BookManager BOOk | |
| .BOO | BOOtstrap (Kermit protocol binary file) | |
| .BOOK | Adobe FrameMaker book | |
| .BOX | Lotus Notes MailBOX | |
| .BOZ | Compressed file archive (bzip over zip) | |
| .BPC | Business Plan Toolkit chart | |
| .BPL | Borland Delphi 4 packed library | |
| .BPP | Clarion Backup aPPlication | |
| .BPS | Ms Works document backup | |
| .BPT | CorelDRAW Bitmap fills file | |
| .BPX | Truevision Targa bitmap image, see .TGA | |
| .BQY | BrioQuery file | |
| .BR | Omnis7 data | |
| .BR | Bridge script | |
| .BRD | Eagle layout file | |
| .BRF | BRieF (dutch for letter) Try WhatFormat to figure out the file format | |
| .BRK | Brooktrout fax | |
| .BRK | Mailer REXX script (The Brake!) | |
| .BRL-CAD | Ballistic Research Laboratory CAD | |
| .BRUSH | Bitmap image (Xerox Doodle Brush file) | |
| .BRX | A file for browsing an index of multimedia options | |
| .BS1 | Apogee Blake Stone game data | |
| .BS2 | BS2 archive | |
| .BSA | BSArc compressed file archive | |
| .BSC | BINSCII Apple II file archive | |
| .BSC | Ms Developer Studio browser information file | |
| .BSC | Source Browser database | |
| .BSC | Ms Fortran Pwbrmake object file | |
| .BSP | Quake map | |
| .BST | BiblioTex file (BiblioTex=bibliography file for TeX) | |
| .BSY | FTN soft BuSY flag | |
| .BTL | Inmos BooTabLe file | |
| .BTM | 4DOS/NDOS batch file (Batch To Memory) | |
| .BTN | Makeover BuTtoN | |
| .BUB | Ipix Spherical panorama | |
| .BUD | Quicken BackUp Disk | |
| .BUFR | Binary Universal Form for the Representation | |
| .BUFR | Meteorological data | |
| .BUG | Bugs and Problems | |
| .BUN | Audio (CakeWalk Audio BUNdle file) | |
| .BUP | BackUP | |
| .BUT | BUTton definitions (Buttons!) | |
| .BV1 | WordPerfect for Win overflow file below insert point in Doc 1 | |
| .BV2 | WordPerfect for Win overflow file below insert point in Doc 2 | |
| .BV3 | WordPerfect for Win overflow file below insert point in Doc 3 | |
| .BV4 | WordPerfect for Win overflow file below insert point in Doc 4 | |
| .BV5 | WordPerfect for Win overflow file below insert point in Doc 5 | |
| .BV6 | WordPerfect for Win overflow file below insert point in Doc 6 | |
| .BV7 | WordPerfect for Win overflow file below insert point in Doc 7 | |
| .BV8 | WordPerfect for Win overflow file below insert point in Doc 8 | |
| .BV9 | WordPerfect for Win overflow file below insert point in Doc 9 | |
| .BW | Silicon Graphics image, see .RGB | |
| .BWB | Visual Baler spreadsheet application | |
| .BWG | BrainWave Generator File | |
| .BWR | Kermit buglist (BeWaRe) | |
| .BWV | Business Wave file | |
| .BYU | BYU Movie | |
| .BZ | bzip compressed file archive | |
| .BZ2 | bzip2 compressed file archive | |
| .B~K | Backup file | |
| Up | ||
| Ext | Description | Goto Shareware |
| .C | C source Notepad | MV |
| .C | Compressed unix file archive (compact) | |
| .C++ | C++ language source code file | |
| .C-- | C-- language source code file (Sphinx C--) | |
| .C00 | Ventura Publisher print file | |
| .C01 | Typhoon wave files | |
| .C4 | Bitmap image (1bit) (JEDMICS CCITT4 format) | |
| .C4B | Clonk binary (game) | |
| .C4D | Clonk object definition (game) | |
| .C4F | Clonk folder (game) | |
| .C4G | Clonk system folder (game) | |
| .C4I | Clonk crewmember info (game) | |
| .C4P | Clonk player (game) | |
| .C4S | Clonk scenario (game) | |
| .C4V | Clonk video (game) | |
| .C4X | Clonk engine (game) | |
| .C64 | Commodore 64 bitmap image | |
| .C86 | C language source code file (Computer Innovation C86) | |
| .CA | Initial cache data for root domain servers (Telnet) | |
| .CA0 | Borland Installer packed and splitted file | |
| .CA7 | Beta 44 job file | |
| .CAB | Archive format (Microsoft CABinet File) Extract.exe, CabView | FMV, WC, WZ |
| .CAC | dBASE IV executable when caching on/off | |
| .CAD | Drafix CAD document | |
| .CAL | CALS Compressed B&W bitmap image (Computer-aided Acquisition and Logistics Support) | PV, SB, TVP |
| .CAL | SuperCalc spreadsheet | QVP |
| .CAL | Windows 3.x CALendar file | |
| .CAL | Ms Schedule+ 1.0 file | |
| .CAL | CyberAudioLibrary link | |
| .CALS | Bitmap image (Computer Aided Acquisition and Logistics Support) | |
| .CAM | Casio QV digital CAMera image | GWS, IV |
| .CAM | Minolta CAM file | PT |
| .CAN | Navigator Fax | |
| .CAP | Ventura Publisher CAPtion | |
| .CAP | ProComm/Telix session CAPture file | |
| .CAP | Compressed music file | |
| .CAS | C + ASM language source (Turbo C) | |
| .CAT | dBASE/CP Backup CATalogue-file | |
| .CAT | IntelliCharge CATegorization file (Quicken) | |
| .CAT | Rational Rose logical package | |
| .CB | Ms Clean Boot file | |
| .CBC | CubiCalc fuzzy logic system | |
| .CBI | Column BInary formatted file (IBM mainframe systems) | |
| .CBL | Cobol language source code file | |
| .CBM | XLib compiled bitmap image | |
| .CBS | MasterWord button bar configuration | |
| .CBT | Computer Based Training (many) | |
| .CC | C++ language source code file (gcc) | |
| .CC | CC language source code file (cc) | |
| .CC | Visual dBASE custom class | |
| .CCA | Data (cc:Mail) | |
| .CCAD | ClarisCAD data | |
| .CCB | Visual Basic animated button configuration | |
| .CCC | Curtain Call bitmap image (native format) | |
| .CCF | Symphony communications configuration file | |
| .CCF | OS/2 Multimedia Viewer configuration file | |
| .CCH | OES Systems Photomodeler Photochip file (thumbnail) | |
| .CCH | CorelChart chart | |
| .CCI | CCITT Group 3 and Group 4 Encoding | |
| .CCITT | CCITT Group 3 and Group 4 Encoding | |
| .CCL | Intalk Communication Command Language file | |
| .CCM | Lotus CC:Mail mailbox | |
| .CCO | Btx Graphics file (XBTX) | |
| .CCO | Data (CyberChat) | |
| .CCRF | Bitmap image (Calcomp Raster File) (B&W or 1bit CMYK for printers) | |
| .CCT | Macromedia Director Shockwave cast | |
| .CD | CD description (DN) | |
| .CDA | CD Audio song CDPLAYER | CMW, WA |
| .CDB | Clipboard | GWS |
| .CDB | CardScan Card DataBase | |
| .CDB | Main database (Turbo C Utilities) | |
| .CDF | Ms Channel Definition Format Mime: application/x-cdf | |
| .CDF | Common Data Format, NSSDC scientific graphical format | |
| .CDF | Cyberspace Description Format, ASCII format describing VRML worlds | |
| .CDF | Unidata netCDF graphics | |
| .CDI | Compact Disk Interactive (Phillips CD-I IFF file) | |
| .CDK | Atari Calamus document | |
| .CDL | CADKey CAD language file | |
| .CDM | Visual dBASE Custom Data Module | |
| .CDM | Novell NetWare Disk Drivers NPA | |
| .CDM | Music format (compressed) | |
| .CDR | CorelDRAW vector image | FMV, GWS, JIR (read only), PSP |
| .CDR | Raw audio-CD data | |
| .CDT | CorelDRAW Template | |
| .CDX | FoxPro compound index | |
| .CDX | Corel Draw compressed drawing | |
| .CE | Computer Eyes (Digital Vision IFF bitmap) | |
| .CEF | CA Clipper workbench application | |
| .CEG | Tempra Show/Edsun Continuous Edge Graphics bitmap image | |
| .CEL | AutoDesk Animator/3D Studio Cel animation (bitmap) | AV, TP |
| .CEL | Bitmap image (15/32bit) (Lumena CEL file) (Time Arts software) | |
| .CEL | CIMFast Event Language file | |
| .CER | Security CERtificate | |
| .CER | Lahey Fortran compilation error messages | |
| .CF | Imake ConFiguration | |
| .CFB | Comptons multimedia file | |
| .CFB | Inmos binary configuration file | |
| .CFG | ConFiGuration file | |
| .CFL | CorelFLOW chart | |
| .CFM | Corel FONT MASTER | |
| .CFM | HyperText Markup Language file (WWW-page), see .HTM | |
| .CFM | Visual dBASE customer form | |
| .CFM | ColdFusion template | |
| .CFN | Atari Calamus font data | |
| .CFO | C Form Object file (Turbo C Utilities) | |
| .CFP | Fax (The Complete Fax Portable) | |
| .CFR | CFR Guidance (NRC Inspection Manual) | |
| .CFS | Inmos configuration file | |
| .CFT | CFast graphics file (Disney Animation Studio) | |
| .CGA | Ventura Publisher CGA display font | |
| .CGI | Common Gateway Interface script (WWW) | |
| .CGL | CodeGuard error log | |
| .CGM | Computer Graphics Metafile vector-image, mostly vectors but also bitmaps | GWS, IM, JIR (read only), PSP, QVP, TP MAC: GC (bin only) |
| .CH | OS/2 configuration file | |
| .CH | CA Clipper header file | |
| .CH1 | Freelance CHart | |
| .CH3 | Harvard Graphics v3.0 CHart/image | QVP |
| .CH4 | Charisma 4.0 presentation | |
| .CHA | CHAt (IRC data) | |
| .CHAT | CHAT (IRC data) | |
| .CHD | FontChameleon font descriptor | |
| .CHI | ChiWriter document | |
| .CHK | CHKdsk/ScanDisk recovered data You may try WhatFormat to help to figure out what they were. | |
| .CHK | WordPerfect for Win temporary file | |
| .CHL | Configuration History Log | |
| .CHM | Compiled HTML file, functional comparable with .hlp | |
| .CHN | Ethnograph 3 data | |
| .CHP | Ventura Publisher CHaPter | |
| .CHR | Borland language stroke font file | |
| .CHT | Harvard Graphics Graphwriter II/SoftCraft Presenter CHarT/image | |
| .CHT | dBASE interface file | |
| .CHW | HTML Help general index, funtional comparable with .gid | |
| .CHZ | CHARC compressed file archive | |
| .CIF | Easy CD Creator CD Image File | |
| .CIF | Ventura Publisher chapter information | |
| .CIF | Caltech Intermediate Format image | |
| .CIF | IUCr Crystallographic Information File | |
| .CIL | Art Gallery clip gallery download package | |
| .CIM | C Text Mode Image File (The Ultimate Draw) | |
| .CIM | SimCity 2000 game data | |
| .CIN | Digital moving Picture eXchange bitmap by the Society of Motion Picture and Television Engineers | |
| .CIN | OS/2 INI file change control file | |
| .CIX | Database index (Turbo C Utilities) | |
| .CK1 | Game data (iD/Apogee Commander Keen 1) | |
| .CK2 | Game data (iD/Apogee Commander Keen 2) | |
| .CK3 | Game data (iD/Apogee Commander Keen 3) | |
| .CK4 | Game data (iD/Apogee Commander Keen 4) | |
| .CK5 | Game data (iD/Apogee Commander Keen 5) | |
| .CK6 | Game data (iD/Apogee Commander Keen 6) | |
| .CKB | Borland C++ 4.x keyboard mapping | |
| .CL | Common LISP language source code file | |
| .CL3 | Easy CD Creator CD layout | |
| .CLA | Clarion source | |
| .CLASS | Java bytecode (compiled class - application) | |
| .CLB | Super NoteTab CLipBook template | |
| .CLD | TerraGen CLouD layer file (landscape renderer) | |
| .CLD | CA Clipper debugger configuration file | |
| .CLDLYR | TerraGen CLouD LaYeR file (landscape renderer) | |
| .CLG | Database of Disk Catalog | |
| .CLL | CrickSoftware Clicker File | |
| .CLO | Cloe image | Various: XNV |
| .CLP | Windows Clipboard file Clipboard Viewer | GWS, IV, JIR, PSP MAC: GC |
| .CLP | Quattro Pro/PCPaint/Pictor bitmap CLiP-art | |
| .CLP | CA Clipper compiler responce file | |
| .CLR | 1st Reader CoLoR binary screen image | |
| .CLR | Photostyler CoLoR definitions | |
| .CLR | Boxer/2 CoLoR scheme | |
| .CLS | Visual Basic/C++ CLaSs module Notepad | |
| .CLW | MFC Class Wizard information (Ms VC++) | |
| .CM | Unix Puzzle bitmap image (8bit) | |
| .CM | CraftMan data | |
| .CMB | Xtree for Windows button bar | |
| .CMD | REXX batch file (OS/2) | |
| .CMD | dBASE/Waffle CoMmanD file | |
| .CMD | 1st Reader external CoMmanD menu | |
| .CMF | Corel Metafile | |
| .CMF | Sound Blaster synthesized FM-sound (Creative Music File) | WA |
| .CMG | Chessmaster saved game | |
| .CMK | Card Shop Plus card | |
| .CML | CML document (Chemical Markup Language) | |
| .CMM | CEnvi CMM script | |
| .CMP | JPEG bitmap image (Lead CMP compression) | TVP |
| .CMP | Address document of Route 66 | |
| .CMP | Photofinish Calibration MaP | |
| .CMP | Compressed data (PKWare compression library) | |
| .CMP | CraftMan data | |
| .CMP | CorelDraw header file for PostScript printer files | |
| .CMP | Ms Word for DOS user dictionary | |
| .CMR | Movie Mediaplayer | |
| .CMRT | CraftMan data | |
| .CMU | Bitmap image (Carnegie Mellon University (CMU) Window Manager bitmap Formats) | |
| .CMUWM | Bitmap image (Carnegie Mellon University (CMU) Window Manager bitmap Formats) | |
| .CMV | CorelMove/CorelDraw 4.0 animation | |
| .CMX | Corel Presentation Exchange vector image | PSP |
| .CMYK | Raw cyan, magenta, yellow and black bytes bitmap image | IM |
| .CNC | CNC general program data | |
| .CNF | CoNFiguration-file (program - printer setup) | |
| .CNM | Windows application menu options and setup file | |
| .CNQ | Compuworks Design shop file | |
| .CNT | Help Contents File | |
| .CNT | Rational Rose 98 contents tab file | |
| .CNV | Word for Windows support file used for import CoNVersion (=DLL) | |
| .CNV | WordPerfect for Win temporary file | |
| .COA | Caligari trueSpace 3D object (ASCII) | AT |
| .COB | Caligari trueSpace 3D object (binary) | AT, PT |
| .COB | Cobol language source code file | |
| .COD | UUPC CODe definition table | |
| .COD | Forecast Plus/Ms Multiplan/StatPac Gold datafile | |
| .COD | Boxer/2 printer CODe definition file | |
| .COD | FORTRAN program compiled CODe | |
| .COD | Source code in assembler with original C code as comments (Ms C) | |
| .COD | Template source file (dBASE Application Generator) | |
| .COD | Videotext file | |
| .COL | COLor palette (Autodesk Animator - many) | |
| .COL | Ms Multiplan spreadsheet | |
| .COM | DOS or CP/M executable (COMmand), mostly smaller than 64 Kb | |
| .CON | Simdir CONfiguration file | |
| .CONF | Unix CONFiguration information | |
| .COO | COOkie file | |
| .CORE | Bitmap image (Core Software Tech CORE IDC file) | |
| .CP8 | CP8 256 Gray Scale image | Various: XNV |
| .CPC | Compressed image (Cartesian Perceptual Compression) | |
| .CPD | Corel PrintOffice drawing | |
| .CPD | Fax Cover document | |
| .CPD | Complaints Desk script | |
| .CPE | Fax cover page | |
| .CPF | Fax (The Complete Fax) | |
| .CPI | DOS font? | |
| .CPI | Bitmap image (Colorlab Processed Image) | |
| .CPI | Code Page Information file (DOS) | |
| .CPJ | CeQuadrat CD ProJect file Notepad | |
| .CPL | Windows Control Panel Module | PP |
| .CPL | Compel presentation | |
| .CPO | Corel Print House data | |
| .CPP | C++ source Notepad | |
| .CPP | CA-Cricket Presents presentation | |
| .CPR | Corel PRESENTS Presentation | |
| .CPS | QEMM backup of startup files | |
| .CPS | Color PostScript | |
| .CPT | Corel PHOTO-PAINT bitmap image, see also .TIF | GWS, IV |
| .CPT | Compact Pro archive format (Macintosh) extpc102.exe | |
| .CPT | dBASE encrypted memo file | |
| .CPT | CA-Cricket Presents Template | |
| .CPX | Compressed drawing (Corel Presentation Exchange) | |
| .CPZ | COMPOZ music text file | |
| .CRA | Advanced CRAck file (usually text) | |
| .CRD | Windows/Yourway CaRDfile database Cardfile | |
| .CRF | Bitmap image (Calcomp Raster File) (B&W or 1bit CMYK for printers) | |
| .CRF | MASM/Zortech C++ Cross-reference | |
| .CRK | CRacK file (usually text) | |
| .CRP | Corel PRESENTS Runtime Presentation | |
| .CRP | Visual dBASE Custom RePort file | |
| .CRP | dBASE IV encrypted database | |
| .CRS | WordPerfect 5.1 File Conversion Resource | |
| .CRT | Internet security CeRTificate | |
| .CRT | Oracle terminal settings information | |
| .CRU | CRUSH compressed file archive | |
| .CSA | Comma Delimited textfile | |
| .CSC | Corel SCRIPT Script | |
| .CSG | Graph (Statistica/w) | |
| .CSH | Unix shell script (csh) | |
| .CSLM | Bitmap image (Zeiss CSLM file) | |
| .CSM | Borland C++ 4.5 precompiled headers | |
| .CSP | PC Emcee Screen Image | |
| .CSS | Cascading Style Sheets, files describing how HTML and XML documents are drawn Mime: text/css | |
| .CSS | CSS/Stats+/Statistica datafile | |
| .CST | Macromedia Director CaST (resource) file | |
| .CSV | Comma Separated Values, this could be a database or spreadsheet file Readable with Notepad | |
| .CSV | CompuShow adjusted EGA/VGA palette | |
| .CSY | EPOC Polymorphic DLL | |
| .CT | SciTex Continuous Tone bitmap image (32bit CMYK), see .SCT | |
| .CT | Bitmap image (32bit) (Iris CT format) (Iris printers) | |
| .CTC | PC Installer control file | |
| .CTF | Symphony character code translation file | |
| .CTL | Visual Basic ConTroL file | |
| .CTL | dBASE IV/Aldus Setup ConTroL file | |
| .CTS | Permanent location ConTentS (ABC programming language) | |
| .CTX | Visual Basic user control binary file | |
| .CTX | PGP ciphertext file | |
| .CTX | Course TeXt file (Microsoft online guides) | |
| .CUBE | Bitmap image (Cubicomp/Vertigo image file) (Cubicomp PictureMaker) | |
| .CUBI | Bitmap image (Cubicomp/Vertigo image file) (Cubicomp PictureMaker) | |
| .CUE | Ms Cue Cards data | |
| .CUF | C Utilities Form definition (Turbo C Utilities) | |
| .CUR | Windows 3.x/95/NT Cursor Resource | AV, IV, QV, QVP Various: XNV |
| .CURSOR | Sun Cursor | Various: XNV |
| .CUT | Dr. Halo bitmap image | GWS, JIR, PSP, PV MAC: GC |
| .CV | Archive (Corel Versions) | |
| .CV | Ms CodeView information screen | |
| .CV4 | CodeView color file | |
| .CVF | SuperStor compressed volume | |
| .CVG | Image format | MAC: GC |
| .CVP | WinFax cover page | |
| .CVS | Canvas bitmap image | |
| .CVT | dBASE IV backup file for ConVerTed database file | |
| .CVW | CodeView color file | |
| .CWEB | C Web | |
| .CWK | ClarisWorks document | |
| .CWL | ClarisWorks library | |
| .CWS | ClarisWorks stationery | |
| .CX | CodeMapper script | |
| .CXT | Macromedia Director Protected Cast (resource) file | |
| .CXX | C++ language source code file (Zortech C++, gcc) | |
| Up | ||
| Ext | Description | Goto Shareware |
| .D64 | Commodore 64 emulator disk file | |
| .DAC | Sound (TI/MIT DAC format) (byte reversed ADC file) | |
| .DA0 | Windows registry backup | |
| .DAT | DATafile, could be text as well as binair data. Sometimes readable with Notepad | |
| .DAT | Video CD MPEG movie (see MPG) | |
| .DAT | WordPerfect merge DATa | |
| SWAPPER.DAT | Swap file | |
| .DB | Paradox/dbVista/Smartware/XTreeGold DataBase | FMV (ODBC needed), QV, QVP, WB |
| .DB | dBASE IV/dBFast/MultiEdit configuration | |
| .DB$ | dBASE/Modula2 temporary file | |
| .DB2 | dBASE II database | |
| .DB3 | dBASE III database | |
| .DBA | Turbo Prolog/DataEase database | |
| .DBC | Visual FoxPro DataBase Container file | |
| .DBD | Business Insight business data | |
| .DBD | Clarion Modula-2 debug info | |
| .DBF | dBASE/FoxPro/dBFast/DataBoss database | FMV (ODBC needed) QV, QVP, WB |
| .DBG | DeBuGger script (DOS debug/Watcom debugger) | |
| .DBG | Symbolic DeBuGing information (Ms C/C++) | |
| .DBK | dBASE Database Backup | |
| .DBM | DataEase datafile | |
| .DBM | DataBoss Menu template | |
| .DBO | dBASE IV compiled program | |
| .DBQ | Paradox memo | |
| .DBS | Managing Your Money/ProDas/SQL Windows datafile | |
| .DBS | Ms Word/Works printer description file | |
| .DBT | dBASE/dBFast memo text for database with same name | |
| .DBT | Clipper database text | |
| .DBT | FoxPro Foxbase+ style memo | |
| .DBW | DataBoss Windows file | |
| .DBX | DataBeam image | |
| .DC5 | DataCAD drawing | |
| .DCA | Visual Basic active designer cache | |
| .DCA | Document Content Architecture text file (IBM DisplayWrite) | |
| .DCF | Disk image file | |
| .DCL | Borland Delphi Component Library | |
| .DCM | DICOM/ACR image | IV |
| .DCP | Data/Device CodePage (OS/2) | |
| .DCR | Shockwave/Macromedia Director data | |
| .DCS | QuarkXPress bitmap image (Quark Desktop Color Separation EPS file) | |
| .DCS | Datafile (ACT! Activity Files) | |
| .DCS | Desktop Color Separation file | |
| .DCT | DiCTionary by many different programs | |
| .DCU | Borland Delphi Compiled Unit | |
| .DCX | ZSoft PC Paintbrush Multi-Page PCX, used as fax Imaging | ACD, IM, IV, PSP, PV, QVP, SB, TVP MAC: GC Various: XNV |
| .DD | DiskDoubler compressed Macintosh file archive | |
| .DDB | Bitmap image | |
| .DDE | Dynamic Data Exchange (binary) | |
| .DDF | Data Definition File describing database (Btrieve, Xtrieve) | |
| .DDI | DiskDupe disk image" | |
| .DDIF | Bitmap image (DEC DDIF file) | |
| .DDP | OS/2 Device Driver Profile file | |
| .DEB | Debug script (DOS DEBug) | |
| .DEC | DECoded file | |
| .DEF | Linker DEFinition file, used in programming environments | |
| .DEF | Assembly header file (Geoworks Esp) | |
| .DEF | SmartWare II data | |
| .DEF | DEFaults/DEFinitions | |
| .DEFI | Oracle 7 de-install script | |
| .DEM | VistaPro DEM image | PT |
| .DEM | USGS & GTopo30 3D file | PT |
| .DEM | A file with USGS standards for Digital Elevation Models | |
| .DEM | DEMo | |
| .DEP | Visual Basic setup wizard DEPendency file | |
| .DER | Internet security certificate | |
| .DES | DEScription | |
| .DESC | DESCription | |
| .DEV | DEVice driver | |
| .DEWF | Macintosh SoundCap/SoundEdit instrument | |
| .DF | NCSA bitmap image (Hierarchical Data File) | |
| .DFD | Prosa Data Flow Diagram graphic | |
| .DFD | Dyadic functions (ABC programming language) | |
| .DFI | Digifont outline font description | |
| .DFL | Default program settings (Signature) | |
| .DFM | Prosa Data Flow Diagram model file | |
| .DFM | Borland Delphi/C++ Builder form file | |
| .DFS | Delight sound file | |
| .DFV | Ms Word printing form | |
| .DFX | AutoCAD 3D/ CAD graphics | |
| .DFX | Micrografx effects (=DLL) | |
| .DGN | MicroStation CAD vector drawing | |
| .DGS | Diagnostics | |
| .DH | Geoworks dependency information for .ph | |
| .DHP | Bitmap image (Dr. Halo PIC) | |
| .DHT | Gauss datafile | |
| .DIA | DIAgraph graphics (Computer Support Corporation) | |
| .DIB | OS/2 or Windows bitmap image (Device Independent Bitmap), mostly the extension .BMP is used Paintbrush | ACD, GWS, IM, IV, JIR, LVP, PSP, QV, QVP, TVP |
| .DIC | DICtionary file. Many different formats used by various programs | |
| .DIF | Visicalc database (Data Interchange Format) | |
| .DIF | DIFference data file (Patch script) | |
| .DIF | OS/2 Display Information File | |
| .DIF | Video | |
| .DIFF | DIFFerence data file (Patch script) | |
| .DIG | Sound Designer I audio | |
| .DIP | Debug Info Processor (Watcom Debugger) | |
| .DIR | CPS Backup/VAX DIRectory file | |
| .DIR | Procomm Plus dialing DIRectory file | |
| .DIR | MacroMind Director 4.x movie format | |
| .DIS | DKB & Qrt Ray-Tracer | Various: XNV |
| .DIS | VAX Mail DIStribution list | |
| .DIS | CorelDraw thesaurus | |
| .DIZ | Mostly As 'File_id.diz' a small description of a program, 40 columns (Description In Zip) Notepad | |
| .DJVU | DjVu image | IV |
| .DKB | DKB-Trace Raytraced image | |
| .DL | Display/DL Viewer animation | MAC: GC |
| .DLD | Lotus 1-2-3 data | |
| .DLG | U.S. Geological Survey Digital Line Graph vector image used for geographical data | |
| .DLG | Windows SDK DiaLoG editor data | |
| .DLG | DiaLoG resources (DN) | |
| .DLL | Windows or OS/2 Dynamic Link Library | FMV, GWS, IV, PP, QV |
| .DLM | FileMaker Pro data | |
| .DLS | Downloadable sound | |
| .DLS | Norton Disklock setup | |
| .DMD | Visual dBASE data module | |
| .DMF | Delusion Digital Music File | |
| .DMO | Derive DeMO | |
| .DMP | DuMP file (eg. screen or memory) | |
| .DMS | Compressed Amiga file archive (DiskMasher) | |
| .DOB | Visual Basic user document form file | |
| .DOC | This may be a simple textfile or a text made by WordPad, MS Word, DisplayWrite v4/5 or WordPerfect v4/5/6. As textfile you can use Notepad as a viewer (see also .TXT). If the text is made by Word for Windows 6.0 then WordPad or QuikView may be used; The Microsoft Word Viewer knows more versions. | MV, FMV, QV, QVP, PP |
| .DOG | Screen file (Laughing Dog Screen Maker) | |
| .DOH | Geoworks dependency information for .poh | |
| .DOK | DOKument, chances are it's a plain text file try Notepad | |
| .DOS | DOS related file (Win95) | |
| .DOS | 1st Reader external command file | |
| .DOT | Ms Word DOcument Template | |
| .DOT | CorelDraw line-type definition file | |
| .DOX | Visual Basic user document binary form file | |
| .DOX | MultiMate 4.0/MS Word text document | |
| .DOZ | Description Out of Zip (VENDINFO) | |
| .DP | Daily Planner calendar file | |
| .DP | DataPhile data file | |
| .DP | Primary data file (THOR database) | |
| .DPD | Dyadic predicates (ABC programming language) | |
| .DPJ | Borland Delphi project | |
| .DPL | Borland Delphi packed library | |
| .DPR | Borland C++/Delphi default project and state-related information | |
| .DPX | Digital moving Picture eXchange bitmap by the Society of Motion Picture and Television Engineers | |
| .DR2D | Primary Vector Drawing code for the Amiga UAE (Amiga emulator for Linux) | |
| .DRAW | Vector image (Acorn's object-based format) | |
| .DRS | WordPerfect for Win Display ReSource | |
| .DRV | Hardware DRiVer | PP, QVP |
| .DRW | Micrografx Draw 2.x, 3.x image | PSP, QVP |
| .DRW | Lotus Freelance image | |
| .DS | TWAIN Data Source (=DLL) | |
| .DS4 | Micrografx Designer vector image | |
| .DSA | PKCS7 signature, DSA | |
| .DSC | SoftImage SCene file | PT |
| .DSC | DeSCription file | |
| .DSC | Oracle DiSCard file | |
| .DSD | DataShaper database | |
| .DSF | Delusion Digital Sound File | |
| .DSF | Micrograpf Designer document | |
| .DSG | 'DOOM' savegame | |
| .DSK | Novell NetWare disk drivers | |
| .DSK | Borland C++ project DeSKtop | |
| .DSL | DSSSL Style Sheet | |
| .DSM | DSI Digital Sound Module | |
| .DSM | Ms Developer Studio macro | |
| .DSN | ODBC Data Source | |
| .DSN | DeSigN (Object System Designer) | |
| .DSP | DLL used by Norton viewer | |
| .DSP | DiSPlay parameters (Signature) | |
| .DSP | Dynamic Studio Professional Module | |
| .DSP | Dr. Halo graphics DiSPlay driver | |
| .DSP | Ms Developer Studio | |
| .DSQ | Corel query file | |
| .DSR | Visual Basic active DeSigneR file | |
| .DSR | WordPerfect for Win driver resource | |
| .DSS | Screensaver file (DCC) | |
| .DSS | Digital Soup Sound | |
| .DST | Embroidery machines graphics data | |
| .DST | WAIN (Scanner spec) data source DLL (Win) | |
| .DSW | Borland C++/MS Developer Studio project workspace | |
| .DSX | Visual Basic active designer binary file | |
| .DT_ | Data fork of a Macintosh file (Mac-ette) | |
| .DTA | DaTAfile, could be text as well as binair data. Sometimes readable with Notepad | |
| .DTA | DaTA file (Turbo Pascal/PC-File/Stata) | |
| .DTD | Document Type Definition (SGML data) | |
| .DTED | Digital Terrain Elevation Data (geographical data format) | |
| .DTF | Q&A/PFS database file | |
| .DTM | DigiTrakker Module | |
| .DTP | PageMagic/Publish-It!/Publisher3 publication | |
| .DTX | Q&A file | |
| .DUN | Dial-up networking export file | |
| .DUP | Backup file (DUPlicate) | |
| .DV | Video | |
| .DVC | Lotus 1-2-3 data | |
| .DVI | TeX DeVice Independent text document | |
| .DVP | AutoCAD DeVice Parameter file | |
| .DVP | DESQview program information file | |
| .DW2 | DesignCAD for Windows drawing | |
| .DWB | Coryphaeus Software Designer workbench | |
| .DWC | DWC compressed file archive | |
| .DWD | DiamondWare digitized sound | GW |
| .DWF | CAD programs vector image | |
| .DWG | AutoCAD/Drafix vector image | |
| .DX | Text file (DEC WPS/DX format - DEC WPS Plus) | QVP |
| .DX | Cross-reference data (THOR database) | |
| .DX | Data explorer document | |
| .DXB | AutoCAD drawing binary exchange format (vector) | |
| .DXF | Drawing Interchange Fileformat, Autodesk AutoCAD vector image, saved in binary or ASCII | AT, PSP, PT, QVP |
| .DXN | Fujitsu dexNET fax | |
| .DXR | Macromedia Director protected (non-editable) movie | |
| .DY22 | Sound (Dyaxis format) (sampling rate 22k) | |
| .DY44 | Sound (Dyaxis format) (sampling rate 44k) | |
| .DYL | EPOC16 dynamic link library | |
| .DYN | Lotus 1-2-3 data | |
| Up | ||
| Ext | Description | Goto Shareware |
| .E3D | Macromedia Extreme3D object | |
| .EAS | OS/2 extended file attributes | |
| .EBJ | Geoworks error-checking object file | |
| .EBS | Rational Rose 98 script source | |
| .EBX | Rational Rose 98 compiled script | |
| .EC | Preprosessed GOC source code file (error-checking version) (Geoworks) | |
| .ECG | Preprosessed GOC source code file (error-checking version) (Geoworks) | |
| .ECL | Active Media ECLipse (screensaver maker) | |
| .ED5 | EDMICS image | |
| .ED6 | EDMICS image | |
| .EDA | Ensoniq ASR disk image | |
| .EDD | Element Definition Document (FrameMaker+SGML documents) | |
| .EDE | Ensoniq EPS disk image | |
| .EDK | Ensoniq KT disk image | |
| .EDM | Active Media Eclipse Data Module | |
| .EDQ | Ensoniq SQ1/SQ2/KS32 disk image | |
| .EDS | Ensoniq SQ80 disk image | |
| .EDT | VAX EDT editor default settings | |
| .EDT | External editors definitions (DN) | |
| .EDV | Ensoniq VFX-SD disk image | |
| .EEB | WordPerfect for Win Equation editor button bar | |
| .EER | Lahey Fortran execution error messages | |
| .EFA | Ensoniq ASR file | |
| .EFC | Sound Effects Generator sound file | |
| .EFE | Ensoniq EPS file | |
| .EFK | Ensoniq KT file | |
| .EFQ | Ensoniq SQ1/SQ2/KS32 file | |
| .EFS | Ensoniq SQ80 file | |
| .EFS | EasyFlow flowchart | |
| .EFT | ChiWriter high resolution screen font | |
| .EFV | Ensoniq VFX-SD file | |
| .EFX | Fax (Everex EFax) | |
| .EGA | Ventura Publisher EGA display font | |
| .EIDI | Bitmap image (Electric Image EIDI file) | |
| .EKA | Borland's Eureka internal data files | |
| .EL | Elisp language source code file (Emacs-Lisp) | |
| .ELC | Compiled ELISP code (Emacs-Lisp) | |
| .ELI | Compressed file archive (ELI) | |
| .ELT | Prosa event list | |
| .EMB | ABT extended module | |
| .EMF | Enhanced Windows Metafile | IV, PSP |
| .EML | Outlook Express EMaiL Notepad Mime: message/rfc822 | |
| .EMU | BITCOM terminal EMUlation data | |
| .ENC | Video format | CMW |
| .ENC | Encoded file - UUENCODEd file (Lotus 1-2-3 - uuencode) | |
| .ENC | Encore music | |
| .END | CorelDraw Arrow-head definition file | |
| .ENFF | Extended Neutral File Format | |
| .ENG | Sprint dictionary engine | |
| .ENG | Matlab ENGine routines | |
| .ENG | ENGlish documentation try Notepad | |
| .ENG | Graphics (charting) (EnerGraphics) | |
| .ENV | ENVelope or ENVironments, may be used by many programs | |
| .ENV | Novell ENVoy data | |
| .ENV | WOPR ENVeloper macro | |
| .EOBJ | Geoworks object code (error-checking version) | |
| .EPD | Express Publisher publication | |
| .EPHTML | Enhanced Perl-parsed HTML file | |
| .EPI | Express Publisher Encapsulated PostScript (text and graphics) | |
| .EPS | Adobe Illustrator text and graphics (Encapsulated PostScript), also used by Corel-TRACE Ghostview Mime: application/postscript | IM, IV, JIR (write only), PSP (write only), PV, SB, TP, TVP |
| .EPS | Printer font (Epson/Xerox...) (Ventura Publisher) | |
| .EPS2 | Adobe Level II Encapsulated PostScript | IM |
| .EPSF | Adobe Encapsulated PostScript text and graphics | IM |
| .EPSI | Adobe Encapsulated PostScript Interchange format | IM |
| .EPSON | Epson printer graphics file | |
| .EQF | WinAmp equalizer settings file | |
| .EQN | WordPerfect for Win EQuatioN | |
| .ER1 | ERWin data | |
| .ERD | Active Media Eclipse Resource Database | |
| .ERD | Prosa Entity Relationship Diagram graphic file | |
| .ERF | Active Media Eclipse Resource File | |
| .ERI | ERWin data | |
| .ERM | Bitmap image | |
| .ERM | Prosa Entity Relationship diagram Model file | |
| .ERR | ERRor log | |
| .ERR | ERRor messages for command line compilers | |
| .ERS | Satellite image header (ER Mapper file) (Earth Resource Mapping) | |
| .ERX | ERWin data | |
| .ESH | Extended Shell batch file | |
| .ESP | Active Media Eclipse Screensaver Project | |
| .ESPS | ESPS audio file | |
| .ETH | Ethnograph 3 document | |
| .ETL | Active Media Eclipse Transition Listing | |
| .ETX | Structure Enhanced (setext) text | |
| .EUC | Japanese text (Kanji) | |
| .EUI | Ensoniq ESP family compacted disk image | |
| .EVP | Sound envelope (general purpose data curves stored as doubles) (mxv) | |
| .EVT | EVenT descriptions | |
| .EVT | EVenT log | |
| .EVY | WordPerfect EnVoY document Here's a plug-in | |
| .EWD | Express Publisher for Windows document | |
| .EWL | Microsoft Encarta document | |
| .EX3 | Harvard Graphics 3.0 device driver | |
| .EXC | Mail/Exchange component? | |
| .EXC | Exclude file for Optimize (do not process) (QEMM) | |
| .EXC | Rexx language source code file (VM/CMS) | |
| .EXC | Text document | |
| .EXE | Executable file Mime: application/octet-stream Mime(2): application/x-msdownload | IV, PP, QV, QVP |
| .EXE | Self-displaying image | GWS |
| .EXE | Self-extracting archive | PKZ, SE, WZ |
| .EXM | Msdos executable system-manager compliant (HP calculator) | |
| .EXP | Express schema (STEP) | |
| .EXP | Protected mode executable program (PharLap) | |
| .EXT | Norton Commander extension file | |
| .EXX | Intermediate file by MsgPut (IBM LinkWay) | |
| .EZF | Fax (Calculus EZ-Fax) |
Thanks to Jouni for allowing me to add his giant extension database to this list and WhatFormat
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