| Home (Frames) | Home (Noframes) |
| Ext | Description | Goto Shareware |
 Up | ||
| .F | Paradox file | |
| .F | Freeze compressed file archive | |
| .F | Fortran language source code file (fixed form) | |
| .F01 | Fax (perfectfax) | |
| .F06 | Dos screen text font - height 6 pixels (fntcol13.zip) | |
| .F07 | Dos screen text font - height 7 pixels (fntcol13.zip) | |
| .F08 | Dos screen text font - height 8 pixels (fntcol13.zip) | |
| .F09 | Dos screen text font - height 9 pixels (fntcol13.zip) | |
| .F10 | Dos screen text font - height 10 pixels (fntcol13.zip) | |
| .F11 | Dos screen text font - height 11 pixels (fntcol13.zip) | |
| .F12 | Dos screen text font - height 12 pixels (fntcol13.zip) | |
| .F13 | Dos screen text font - height 13 pixels (fntcol13.zip) | |
| .F14 | Dos screen text font - height 14 pixels (fntcol13.zip) | |
| .F16 | Dos screen text font - height 16 pixels (fntcol13.zip) | |
| .F2R | Music (Farandole Linear Module format) | |
| .F3R | Music (Farandole blocked linear module format) | |
| .F77 | Fortran 77 language source code file | |
| .F90 | Fortran 90 language source code file (free form) | |
| .F96 | Fax (Frecom FAX96) | |
| .FAC | UNIX Faceserver bitmap image (Usenix FACE) | |
| .FACE | UNIX Faceserver bitmap image (Usenix FACE) | |
| .FAL | Bitmap graphics (image header information) (Q0 format) | |
| .FAQ | Frequently Asked Questions Notepad | |
| .FAR | Music (Farandole Composer Module) | |
| .FAS | Macsyma compiled program | |
| .FAV | Ms Outlook FAVorites shortcut | |
| .FAX | Fax (generic Group 3 1bit encoded data) (most Fax programs) | IM (Group 3), PV, TVP |
| .FB | Backup file made by Novell (DR)Dos' FastBack Express (fbx.exe) | |
| .FB? | FastBack Plus file | |
| .FBK | Navison Financials backup | |
| .FBM | Fuzzy BitMap | |
| .FC | Harvard Graphics 2.0 spell checking dictionary | |
| .FCD | FastCad or EasyCad image | |
| .FCD | Virtual CDROM | |
| .FCL | CyberAudioLibrary link | |
| .FCM | Binary file patch file (forward compression) (jlpak10.zip) | |
| .FD | Ms Fortran declaration file | |
| .FD | DataFlex field offsets for compiler | |
| .FD | Front Door resource file | |
| .FDB | Navison Financials database | |
| .FDF | Adobe Acrobat forms document, see also .PDF | |
| .FDL | Paradox delivered form | |
| .FDW | Form (F3 Design and Mapping) | |
| .FEB | WordPerfect for Win figure editor button bar | |
| .FEI | Geoworks Fatal Error Infotable | |
| .FEM | CADRE Finite Elements Mesh file | |
| .FES | File produced when a fileless occurrence in 3D Topicscape is exported to Windows. (Used for a round-trip re-import) | 3DT |
| .FF | Intelligont FIAS format | |
| .FF | Agfa Compugraphics outline font description | |
| .FFA | FastFind file | |
| .FFF | Fax (defFax) | |
| .FFF | GUS PnP bank file format | |
| .FFI | Atech FastFont (AllType) | |
| .FFIVW | ASCII File Format for the Interchange of Virtual Worlds (VRML) | |
| .FFL | FastFind file | |
| .FFO | FastFind file | |
| .FFT | Text file (IBM DCA/FFT Final Form Text - DisplayWrite) | QVP |
| .FFT | Fast Fourier Transform analysis data | |
| .FFX | FastFind file | |
| .FH3 | Aldus FreeHand 3.x vector image | |
| .FH4 | Aldus FreeHand 4.x vector image | |
| .FI | Ms Fortran Interface file | |
| .FIF | Fractal Image File. New image format, small size Fractal Viewer Mime: application/fractals | GWS |
| .FIF | Altamira Genuine Pixels 1.0 compressed format | |
| .FIG | TransFIG image format | IM |
| .FIG | Data (REND386/AVRIL) | |
| .FIG | Linker options (Lahey Fortran) | |
| .FIL | WordPerfect overlay | |
| .FIL | File listing | |
| .FIL | File template (Application Generator) | |
| .FIL | Files list object file (dBASE Application Generator) | |
| MIRROR.FIL | saved FAT | |
| .FIN | Print-formatted text file (Perfect Writer/Scribble/MINCE) | |
| .FIO | Image PALS viewer DLL | |
| .FIO | Aldus PhotoStyler graphics filter | |
| .FIT | Graphics and data (Flexible Image Transport System) | GWS, IM Various: XNV |
| .FIT | File Index Table (Windows NT) | |
| .FITS | Flexible Image Transport System, see .FIT | |
| .FIX | Patch file | |
| .FKY | FoxPro macro file | |
| .FL | Sound (Floating format) (hardware dependent, not transportable) | |
| .FLA | Editable Macromedia Flash Movie | |
| .FLB | Papyrus Format LiBrary | |
| .FLC | Autodesk Animator animation (AutoDesk FLIC format) (newer format of .FLI) | AV, GWS MAC: GC Win & Mac: QT |
| .FLD | Charisma folder | |
| .FLF | Firehand Technologies Firehand Lightening picture presentation file (slide-show) | |
| .FLF | Corel Paradox delivered form | |
| .FLF | Navison Financials license file | |
| .FLI | Autodesk Animator animation (AutoDesk FLIC format) | AV, GWS MAC: GC Win & Mac: QT |
| .FLI | Tex font library (EmTeX) | |
| .FLM | Image format used on Atari | |
| .FLM | Film Roll (AutoCAD/AutoShade) | |
| .FLT | Import FiLTer (=dll) (Aldus/Micrografx Picture Publisher/Ms Word) | |
| .FLT | Autodesk Animator Animation | |
| .FLT | MultiGen FLighT | |
| .FLT | OpenFlight file | PT |
| .FLT | Graphics FiLTer (Asymetrix ToolBook/Corel) | |
| .FLX | Animation format | |
| .FLX | DataFlex compiled binary | |
| .FLX | Database (Flexstor format) | |
| .FM | FileMaker Pro database | |
| .FM1 | Spreadsheet (Lotus 1-2-3 release 2.x) | |
| .FM3 | Spreadsheet (Lotus 1-2-3 release 3.x) | |
| .FM3 | Harvard Graphics 3.0 device driver | |
| .FMB | Oracle binary source code for form | |
| .FMB | WordPerfect for Win File Manager Button bar | |
| .FMF | IBM LinkWay font or icon file | |
| .FMK | Fortran PowerStation makefile | |
| .FML | File Mirror List (GetRight) | |
| .FMO | dBASE IV compiled format file | |
| .FMT | Ms Schedule+ print file Notepad | |
| .FMT | Fast loading format (TeX) | |
| .FMT | ForMaT file (dBASE IV/FoxPro/Clipper 5/dBFast/Gate3) | |
| .FMT | Sprint style sheet | |
| .FMT | Oracle text format of form | |
| .FMV | Full Motion Video file | |
| .FMX | Oracle executable form | |
| .FN3 | Harvard Graphics 3.0 font file | |
| .FND | Saved search W95 | |
| .FNG | Font group file (Font Navigator) | |
| .FNK | FunkTracker music | |
| .FNL | APIS32 Functions Library | |
| .FNT | FoNT file (many) | |
| .FNX | Exact inactive font | |
| .FO1 | Borland Turbo C font file | |
| .FO2 | Borland Turbo C font file | |
| .FOG | Fontographer database file | |
| .FOL | 1st Reader folder of saved messages | |
| .FON | Bitmap FONt with fixed size (many - Windows 3.x font library) Fontview.exe | FMV, PP |
| .FON | Procomm Plus log of all calls | |
| .FON | Phonebook (Terminate/Terminator/Telix) | |
| .FONT | Font data (unix) | |
| .FOP | Freedom of Press bitmap image | |
| .FOR | FORtran source code | |
| .FOR | WindowBase form | |
| .FOT | Truetype font styles file belonging to .TTF, used in Windows 3.x | |
| .FOX | Foxbase executable (precompiled .prg) | |
| .FP | FoxPro configuration file | |
| .FP | FileMaker Pro data | |
| .FP1 | Flying Pigs for Windows game data | |
| .FP3 | Filemaker Pro 3.0 database | |
| .FPC | FoxPro Catalog | |
| .FPD | TMT Pascal compiled unit | |
| .FPT | FoxPro memo field tables | |
| .FPW | FloorPLAN plus for Windows drawing | |
| .FPX | Kodak FlashPiX bitmap image | IM, IV, PSP |
| .FR3 | Renamed dBASE III+ form file | |
| .FRE | FREnch documentation try Notepad | |
| .FRF | FontMonger font database file | |
| .FRG | dBASE IV uncompiled report file | |
| .FRL | GP-Forth library | |
| .FRM | Visual Basic source file belonging to a FoRM Notepad | |
| .FRM | Frame Stacks | |
| .FRM | Form Letter in WordPerfect | |
| .FRM | Order or registration FoRM (textfile) Notepad | |
| .FRM | Fractint FoRMula | |
| .FRM | Report file (dBASE IV/Clipper 5/dBFast) | |
| .FRO | dBASE IV compiled report file | |
| .FRP | Form (PerForm PRO Plus/FormFlow) | |
| .FRS | WordPerfect for Win screen font resource | |
| .FRT | FoxPro additional (FPT) report description file | |
| .FRT | GP-Forth language source code file | |
| .FRX | Binair file belonging to Visual Basic .FRM | |
| .FRX | FoxPro Main (DBF) report description file | |
| .FRZ | EPOC FReeZe file | |
| .FS | Bitmap image (Usenix FaceServer file) | |
| .FSL | Corel Paradox saved form | |
| .FSM | Farandole Composer WaveSample music format | |
| .FSP | fPrint Audit Tool file format | |
| .FSSD | Sound | |
| .FST | dBFast linkable program | |
| .FSX | Lotus 1-2-3 data | |
| .FT | Lotus Notes Full Test index | |
| .FTG | Windows Help full text search group file | |
| .FTM | Micrografx font file | |
| .FTN | Fortran language source code file (fixed form) | |
| .FTP | Configuration (FTP Software PC/TCP) | |
| .FTP | FTP Voyager document | |
| .FTS | Graphics and data (Flexible Image Transport System), see .FIT | |
| .FTS | Windows Help Full Text Search index | |
| .FW | FrameWork database | |
| .FW2 | FrameWork II database | |
| .FW3 | FrameWork III database | QVP |
| .FWEB | Fortran WEB | |
| .FX | FastLynx online guide | |
| .FXD | WinFax | FMV |
| .FXD | FAXit phonebook | |
| .FXP | FoxPro executable precompiled .prg | |
| .FXR | WinFax | FMV |
| .FXS | WinFax fax Transmit Format graphics | FMV |
| .FZB | Casio FZ-1 Bank dump | |
| .FZF | Casio FZ-1 Full dump | |
| .FZP | Dye Sub printing support file (Fargo Primera colour printer) | |
| .FZV | Casio FZ-1 Voice dump | |
| Up | ||
| Ext | Description | Goto Shareware |
| .G | Paradox file | |
| .G | APPLAUSE data chart | |
| .G16 | GoldED for DOS compiled config | |
| .G3 | G3 fax file | IV |
| .G8 | Cubicomp PictureMaker green channel image data (24bit 3D animation) | |
| .G8 | PicLab raw graphics (one byte per pixel) | |
| .GAL | Corel Multimedia Manager Album | |
| .GAL | Hewlett-Packard Graphics GALlery | |
| .GAM | Fax (GammaFax) | |
| .GB | Chinese text | |
| .GB | Gameboy game | |
| .GBL | GloBaL module in Basic program | |
| .GBL | VAXTPU editor GloBaL definitions | |
| .GBR | Gimp BRush | Various: XNV |
| .GC1 | Golden Common Lisp 1.1 source code file | |
| .GC3 | Golden Common Lisp 3.1 source code file | |
| .GCD | Generic CAD Drawing format (vector) | |
| .GDF | GEOS Dictionary File | |
| .GDS | McDonnell-Douglas Things | |
| .GE | GEcho config file | |
| .GED | Wicat image | |
| .GED | GoldED for DOS compiled config file | |
| .GED | Graphics (Graphic Environment Document) (Arts & Letters) | |
| .GED | EnerGraphics graphics editor file | |
| .GEF | Graphics Exchange Format | |
| .GEM | Ventura Publisher vector image (Graphics Environment Manager, Digital Research GEM metafile) | PSP, PV, TP, TVP MAC: GC |
| .GEN | Compiled template (dBASE Application Generator) | |
| .GEN | Ventura Publisher GENerated text file | |
| .GEO | VideoScape 3D object | AT |
| .GEO | GoldED for OS/2 compiled config file | |
| .GEO | Geoworks Geode (GEOS executable) | |
| .GER | GERman documentation try Notepad | |
| .GEX | GEcho config file | |
| .GF | MetaFont font file | |
| .GFB | GIFBlast compressed GIF image | |
| .GFI | Genigraphics Graphics Link presentation | |
| .GFO | SGI Radiosity | |
| .GFT | Font file (GEM/NeoPaint) | |
| .GFX | Instant Artist image | |
| .GFX | Genigraphics Graphics Link presentation | |
| .GIB | Chart (Graph-in-the-Box) | |
| .GID | General InDex of a Win 95 help file | |
| .GIF | CompuServe bitmap image (Graphics Interchange Format), max. 256 colors, could be single page or animated. Uses LZW compression. Because of the small size it is often used on Internet Imaging Mime: image/gif | ACD, GWS, IM, IV, JIR, LVP, PSP, PV, SB, TP, TVP. ACD, GWS, IV and PV also show them animated MAC: GC Win & Mac: QT Various: XNV |
| .GIFF | CompuServe bitmap image (Graphics Interchange Format), see .GIF | |
| .GIM | Genigraphics Graphics Link presentation | |
| .GIS | Erdas gray-scale bitmap image | |
| .GIW | Presentation (Graph-in-the-Box for Windows) | |
| .GIX | Genigraphics Graphics Link presentation | |
| .GKH | Ensoniq disk image (sound) (VFX SD EPS ASR TS) | |
| .GKS | Graphics Kernel System | |
| .GL | Animation (GRASP - GRAphical System for Presentation format) | |
| .GL | GALink script | |
| .GLB | GLoBal module in Basic program | |
| .GLM | Glim datafile | |
| .GLO | GLObal module in Basic program | |
| .GLO | Auxiliary for glossary (LaTeX) | |
| .GLS | Across datafile | |
| .GLY | Ms Word GLossarY | |
| .GM | Bitmap image (Autologic files) | |
| .GM2 | Bitmap image (mode 2 black/white) (Autologic files) | |
| .GM4 | Bitmap image (mode 4 gray-scale) (Autologic files) | |
| .GMD | Sound | |
| .GMF | APPLAUSE CGM image | |
| .GMP | Geomorph tile map (SPX) | |
| .GNA | Genigraphics Graphics Link presentation | |
| .GNT | Generated code (Micro Focus COBOL/2) | |
| .GNX | Genigraphics Graphics Link presentation | |
| .GO | GraphOn bitmap image | |
| .GOBJ | Geoworks object code (non-error-checking version) | |
| .GOC | Geoworks GOC language source code file | |
| .GOE | Satellite image data (GOES file) (McIDAS system) | |
| .GOES | Satellite image data (GOES file) (McIDAS system) | |
| .GOH | Geoworks Goc language header file | |
| .GOULD | Bitmap image (Gould scanner file) | |
| .GP | Geoworks Geode parameter file | |
| .GP | Gofer project (Haskell language dialect) | |
| .GP3 | Format used in Guitar pro | |
| .GP4 | GTX Group IV format | |
| .GP4 | Format used in Guitar pro | |
| .GPG | GNU Privacy Guard | |
| .GPH | Freelance Graphics for OS/2 | |
| .GPH | Graph (Lotus 1-2-3/G) | |
| .GPK | Compressed Omnigo file archive (Geos package) | |
| .GPT | Format used in Guitar pro | |
| .GQ | Epson's page description language (printer) | |
| .GR2 | Win 3.x screen driver | |
| .GRA | Ms Graph chart | |
| .GRA | SigmaPlot datafile | |
| .GRADS | Metafile | |
| .GRASP | Animation (GRAphical System for Presentation format) | |
| .GRAY | Bitmap image (raw gray bytes) | |
| .GRB | Bitmap image B&W binary (GROB Graphic Object) (HP-48sx calculator) | |
| .GRB | Ms-DOS Shell Monitor file | |
| .GRD | Adobe Photoshop gradient file | |
| .GRD | Drivers for GRX (graphics library) | |
| .GRDEF | Geoworks UI resource file | |
| .GRF | Stanford image | |
| .GRF | Graph file (Graph Plus/Charisma) | |
| .GRIB | Gridded Binary (FM 92-VIII Ext. GRIdded Binary file) (WMO CBS) | |
| .GRN | Drivers for GRX (graphics library) | |
| .GRP | Windows 3.x program GRouP file | |
| .GRP | PixBase pictures GRouP | MAC: GC |
| .GRY | Image (Raw GREY) | |
| .GS | Gofer script (Haskell language dialect) | |
| .GS1 | GraphShow presentation | |
| .GSD | GSM internet realtime audio | |
| .GSD | Professional Draw vector image | |
| .GSP | Geometer's Sketchpad sketch | |
| .GSM | Sound (GSM 6.10 prI-ETS 300 036 13kbit/s) (Internet phones) | |
| .GSS | Geometer's Sketchpad script | |
| .GSW | GraphShow worksheet | |
| .GTAR | GNU tar compressed file archive | |
| .GTX | Raster graphics (GTX Group IV) | |
| .GUP | PopMail data | |
| .GV | GrandView outline | |
| .GWX | Genigraphics Graphics Link presentation | |
| .GWZ | Genigraphics Graphics Link presentation | |
| .GXL | Genus graphics library | |
| .GYM | Geoworks generic symbol file | |
| .GZ | GZIP File. Archive for Unix, just compression Gzip Mime: application/x-gzip | PKZ, SE, WC, WZ |
| .GZIP | GZIP File, see .GZ | |
| .GZL | Go!Zilla filelist | |
| Up | ||
| Ext | Description | Goto Shareware |
| .H | Header File, mostly belonging to .C or .CPP file Notepad | MV |
| .H! | Help database (Flambeaux Help/Perfect Database) | |
| .H++ | C++ header file | |
| .H-- | Sphinx C-- header file | |
| .HA | Compressed file archive (HA) | |
| .HAL | Data file (Hyper Access Lite OS/2) | |
| .HAM | Novell NetWare disk drivers NPA | |
| .HAP | Compressed file archive (HAP) | |
| .HBK | MathCAD HandBooK | |
| .HBM | Hotline BookMark | |
| .HC | Header file | |
| .HCOM | Sound (Macintosh) | |
| .HDF | Hierarchical Data Format bitmap image (NCSA) | IM |
| .HDF | Help file (Help Development Kit | |
| .HDF | Procomm Plus alternate download file listing | |
| .HDR | Pc-File+ database HeaDeR | |
| .HDR | Egret datafile | |
| .HDR | Message HeaDeR (Procomm Plus/1st Reader) | |
| .HDS | Hierarchical Data System | |
| .HDW | Harvard Draw vector image | |
| .HDX | Help index (AutoCAD/Zortech C++) | |
| .HED | HighEdit document | |
| .HEL | Ms Hellbender game data | |
| .HEP | Novell NetWare Help Librarian data file | |
| .HEX | Macintosh BinHex encoded file archive (ASCII) | |
| .HEX | Hex dump | |
| .HFI | Hp Font Info file (GEM) | |
| .HGL | HP Graphics Language vector image | PSP |
| .HGL | Highlight groups definitions (DN) | |
| .HH | C++ header file | |
| .HHC | HTML Help Table Of Contents file, funtional comparable with .cnt | |
| .HHH | Power C precompiled header file | |
| .HHK | HTML Help index file | |
| .HHP | Procomm Plus help information for remote users | |
| .HHP | HTML Help project file, funtional comparable with .hpj | |
| .HI | HIgh scores (various games) | |
| .HIG | HIGh scores (various games) | |
| .HIN | HyperChem molecule | |
| .HIPS | Bitmap image (HIPS file) | |
| .HIS | HIStory of executing/viewing/editing (DN) | |
| .HKC | HTML-KIT auto complete short-cuts | |
| .HLB | VMS help library | |
| .HLP | HeLP file As Windows help file it should be associated with Winhelp.exe or Winhlp32.exe | |
| .HLP | HeLP text Notepad | |
| .HLX | MultiEdit help file | |
| .HLZ | MultiEdit packed help file | |
| .HM | Windows help 'Help Map' file | |
| .HMI | MIDI music | WA |
| .HMM | Procomm Plus Alternate Mail Read option menu | |
| .HMP | MIDI music | WA |
| .HMP | 3D Gamestudio height map - often used with terrains | |
| .HMZ | Sound | WA |
| .HNC | CNC program files Heidenhain (?) dialog | |
| .HOF | 'Hall Of Fame' game data (best scores) | |
| .HP | Primary hash file (THOR database) | |
| .HP | Printout file for HP printers/plotters (HP/GL) | |
| .HP8 | Text in HP Roman8 character set (NewWave Write) | |
| .HPF | PageMaker HP LaserJet fonts | |
| .HPG | Vector image (HPGL plotter file) (AutoCad/Harvard Graphics) | |
| .HPGL | Vector image (HPGL plotter file) (Hewlett-Packard Graphics Language) | |
| .HPI | GEM font information | |
| .HPJ | Ms Help Compiler Help ProJect file, the compiler uses this file to combine .hm and .rtf files to a compiled .hlp file | |
| .HPJ | Printed to file (HP LaserJet) | |
| .HPK | HPack compressed file archive | |
| .HPL | Vector image (Hewlett-Packerd LasetJet) | |
| .HPLJ | Vector image (Hewlett-Packerd LasetJet) | |
| .HPM | Alternate Main menu for privileged users (Procomm Plus) | |
| .HPM | Emm text (HP NewWave) | |
| .HPM | Quaestor 1.x High Performance Map | |
| .HPP | C++ header (Zortech C++/Watcom C/C++) | |
| .HPP | Vector image (Hewlett-Packard Printer Control Language) | |
| .HPPCL | Vector image (Hewlett-Packard Printer Control Language) | |
| .HQX | BinHex archive format, often used on Macintosh Mime: application/mac-binhex40 | PKZ, SE Mac: SE |
| .HRC | SoftImage model 3D file | PT |
| .HRF | CADCore bitmap image (Hitachi Raster Format) | |
| .HRH | Common header for resources and C++ | |
| .HRM | Alternate Main menu for limited/normal users (Procomm Plus) | |
| .HRZ | SSTV, Slow Scan TeleVision file | GWS |
| .HS | Literate Haskell source code file | |
| .HS2 | Postering monochrome image | |
| .HSC | 2-op FM music file (HSC tracker) | |
| .HSI | Handmade Software Inc bitmap image (Image Alchemy) | |
| .HSP | HomeSite WWW page project | |
| .HST | HiSTory file | |
| .HST | Handmade Software graphics histogram (HSI raw file) | |
| .HT | HyperTerminal file | |
| UPDATE.HTA | File left behind by the Bubbleboy virus. Check out Norton's method for removal instructions | |
| .HTM | HyperText Markup Language file (WWW-page), view using a web-browser like Netscape, Internet Explorer or Opera. Notepad shows the HTML-codes Mime: text/html | FMV, QVP |
| .HTML | HyperText Markup Language file (WWW-page), see .HTM | |
| .HTMLS | HyperText Markup Language document with server-side include (WWW) | |
| .HTT | HyperText Template Mime: text/webviewhtml | |
| .HTX | Ms FrontPage HTML template | |
| .HWD | Hollywood presentation | |
| .HX | Cross-reference hash file (THOR database) | |
| .HXM | Alternate Protocol Selection menu for all users (Procomm Plus) | |
| .HXX | C++ header | |
| .HY1 | Ventura Publisher hyphenation algorithms | |
| .HY2 | Ventura Publisher hyphenation algorithms | |
| .HYC | WordPerfect data | |
| .HYD | WordPerfect for Win hyphenation dictionary | |
| .HYP | Hyper compressed file archive | |
| .HZ | Chinese text | |
| Up | ||
| Ext | Description | Goto Shareware |
| .I | Phase Vocorder analysis data | |
| .I | Preprocessor output file (Borland C Preprocessor) | |
| .I3 | Interface source (Modula-3) | |
| .IAX | Bitmap image (IBM Image Access eXecutive file) | |
| .IBG | Planetary images by NASA (PDS format) | |
| .IBM | Commodore Amiga graphics | |
| .IBM | Compressed file archive (Internal IBM only) (ARCHDOS) | |
| .IC | M3CG intermediate language file (Modula-3) | |
| .IC1 | Bitmap image (Atari Image) | |
| .IC2 | Bitmap image (Atari Image) | |
| .IC3 | Bitmap image (Atari Image) | |
| .ICA | IoCA ICon Archive (Image Object Content Architecture) | PV, SB |
| .ICA | Citrix file | |
| .ICB | Truevision Targa bitmap image, see .TGA | |
| .ICC | Bitmap image (Kodak ICC printer file) | |
| .ICE | Lempel Ziv Huffman archive | |
| .ICE | Cooltalk audio? Mime: x-conference/x-cooltalk | |
| .ICL | ICon Library | FMV, IV |
| .ICM | ICC Printer/Monitor profile? | |
| .ICN | Icon Resource (RIP icon) Paint, Imaging | GWS, IV, PSP, QV |
| .ICN | Icon language source code file | |
| .ICO | Windows 3.x/95/NT ICOn Resource | AV, FMV, GWS, IM (read only), IV, QVP, SB, TP MAC: GC Various: XNV |
| .ICO | Gimp ICOn | Various: XNV |
| .ICON | Icon image (1bit) (Sun icon file) (Unix) | Various: XNV |
| .ICP | IContact Parameter file (Unix) | |
| .ICR | Bitmap image (NCSA Telnet Interactive Color Raster graphic file) | |
| .ID | Disk identification file | |
| .IDB | IDA database | |
| .IDC | Bitmap image (Core Software Tech CORE IDC file) | |
| .IDC | Document (Internet Database Connector) | |
| .IDC | IDA C language source code file | |
| .IDD | MIDI Instrument Definition | |
| .IDE | Project (Borland C++ 4.x) | |
| .IDF | MIDI-instrument definition | |
| .IDL | Visual C++ interface definition file | |
| .IDS | Imported names format (IDA) | |
| .IDW | IntelliDraw vector image | |
| .IDX | InDeX file, used by many applications | |
| .IDX | Header information (CMYK image) (Stork format) | |
| .IEF | Bitmap image (Image Exchange Format) Mime: image/ief | |
| .IFD | Form (JetForm Design) | |
| .IFF | Bitmap image, many formats possible: Deluxe Paint, Electronic Arts, Amiga IFF ILBM, Sun TAAC Image File Format | ACD, GWS, IV, JIR, PSP, PV, SB, TP MAC: GC Various: XNV |
| .IFF | Sound (Amiga IFF/8SVX Audio Interchange File Format), see also AIFF | GW |
| .IFF | TDI Explore & Alias Wavefront image, see .TDI | |
| .IFF | DESR VFF greyscale bitmap image, see .VFF | |
| .IFP | KnowledgeMan script | |
| .IFS | YuvPak fractal image compressed file | |
| .IFS | Installable File System (OS/2) | |
| .IFS | Iterated Function System fractal (Fractint) | |
| .IG | Modula-3 generic interface source | |
| .IGES | 2D or 3D CAD model (Initial Graphics Exchange Specification format), see .IGS | |
| .IGF | Inset Systems metafile | |
| .IGS | 2D or 3D CAD model (Initial Graphics Exchange Specification format) | PT |
| .IHP | Watcom help file | |
| .IHS | Inbound History (Bink/+) | |
| .II | Preprocessed C++ source code (gcc) | |
| .IIF | QuickBooks for Windows interchange file | |
| .III | Intel IPhone-compatible Mime: application/x-iphone | |
| .IKO | Windows Icon Resource, see .ICO | |
| .IL | hDC Designer Icon Library (=DLL) | |
| .IL | Inline expansion file (Fortran 90) | |
| .ILB | Scream Tracker data | |
| .ILBM | Bitmap image (Amiga Interleaved BitMap format) | |
| .ILK | Outline of program's format (incremental linker) (Ms ILink) | |
| .IM | AIM Grey Scale image? See .IMA | |
| .IM | Bitmap image (Sun raster file) | |
| .IM1 | Bitmap image (1bit) (Sun raster file) | |
| .IM24 | Bitmap image (24bit) (Sun raster file) | |
| .IM32 | Bitmap image (32bit) (Sun raster file) | |
| .IM8 | Bitmap image (8bit) (Sun raster file) | |
| .IMA | AIM Grey Scale image? | Various: XNV |
| .IMA | Image (WinImage) | |
| .IMA | Mirage vector image (EGO/Chart/Autumn) | |
| .IMAGE | Disk image (Disk Copy/ShrinkWrap) | |
| .IMG | Bitmap image, GEM Paint/Ventura, originally from Atari | GWS, IV, JIR, PSP, PV, QVP, TP, TVP MAC: GC Various: XNV |
| .IMG | Vivid image | Various: XNV |
| .IMG | Disk image (Disk Copy/ShrinkWrap) | |
| .IMP | Lotus IMProv Spreadsheet | |
| .IMP | Compressed file archive (IMP) | |
| .IMP | Pascal implementation | |
| .IMQ | ImageQ image presentation | |
| .IMQ | Planetary images by NASA (PDS format) | |
| .IN | INput | |
| .IN$ | Installation file (HP NewWave) | |
| .IN3 | Harvard Graphics 3.0 input device driver | |
| .INB | Test script (Vermont HighTest) | |
| .INC | INClude file (several programming languages) | |
| .IND | dBASE IV data index | |
| .INF | Setup INFormation used in Windows Notepad | |
| .INF | INFormation text Notepad | |
| .INF | Hypertext help system file (OS/2) | |
| .INFO | GNU info reader (output from texinfo) (unix) | |
| .INFO | Amiga icon data | |
| .INGR | Intergraph Raster File Format | |
| .INI | INItialisation file used in Dos and Windows Notepad | PP |
| MAIL.INI | Mail initialization file of Ms Internet Mail for Win 3.1 | |
| .INK | Pantone reference fills file (CorelDraw) | |
| .INL | C++ INLine function implementation | |
| .INN | Micro Focus COBOL/2 overlay | |
| .INS | Often used as INStallation file Notepad | |
| .INS | Internet Communication Settings (MS IIS) Mime: application/x-internet-signup | |
| .INS | Adlib/Ensoniq INStrument file | |
| .INS | WordPerfect datafile | |
| .INT | Borland INTerface module source | |
| .INT | Signature/Micro Focus COBOL/2 INTermediate code (semi-compiled) | |
| .INX | Foxbase INdeX | |
| .IO | CPIO compressed file archive | |
| .IO | Modula-3 object file | |
| .IOB | 3D object, Imagine 1, 2 or Turbo Silver | AT, PT |
| .IOC | Instant ORGcharting! organizational chart | |
| .ION | As 'Descript.ion' a small textfile (file descriptions) (4DOS) Notepad | |
| .IP | Interactive Physics data | |
| .IP | Inspection Procedures (NRC Inspection Manual) | |
| .IPL | Pantone Spot reference palette file (CorelDraw) | |
| .IPS | IPScript (IPIX) | |
| .IPX | Ipix Spherical panorama | |
| .IQY | Ms Excel web query file | |
| .IRC | Sound (IRCAM format) | |
| .IRIS | Silicon Graphics Raw Red, Green and Blue bytes image, see .RGB | |
| .IRS | WordPerfect resource | |
| .IRTP | Image (Graphicon-2000 Interactive Real-Time PHIGS) | |
| .IS | Modula-3 intermediate assembly file | |
| .ISD | RapidFile spelling checker dictionary | |
| .ISH | Image Speeder Image | Various: XNV |
| .ISH | Compressed file archive (ISH) | |
| .ISO | Easy CD Creator CD image file | |
| .ISO | ISO-9660 table | |
| .ISP | Internet Service Provider settings (Ms IIS) Mime: application/x-internet-signup | |
| .ISU | Windows uninstall script by Stirling Technologies | |
| .IT | Impulse Tracker music | WA |
| .IT | Settings (intalk) | |
| .ITA | ITAlian documentation try Notepad | |
| .ITF | InTerFace file (JPI TopSpeed Pascal) | |
| .ITS | Internet Document Set | |
| .IV | Inventor VRML Format by Silicon Graphics | |
| .IV-VRML | Inventor VRML Format document | |
| .IVB | Bitmap image (Truevision Targa format) | |
| .IVF | Indeo Video | AV |
| .IVR | Virtual reality world (live picture) | |
| .IVT | InfoViewer information title | |
| .IVUE | Live Picture multi-view format | |
| .IW | Presentation flowchart (IconAuthor/HSC InterActive) | |
| .IW | Idlewild screensaver | |
| .IW44 | DjVu image | IV |
| .IWA | IBM Writing Assistant text document | |
| .IWP | Wang text document | |
| .IX | Modula-3 linker information | |
| .IZT | Binary token file (IZL) | |
| Up | ||
| Ext | Description | Goto Shareware |
| .J | JAR archive, new archiver from ARJ Software, Inc. Download it here | |
| .J2L | File for Jazz Jackrabbit 2, opened by Jazz Creation Station | |
| .J2T | File for Jazz Jackrabbit 2 | |
| .JAM | Jam messagebase (FTN software) | |
| .JAM | Jam music (JamTracker module) | |
| .JAR | JAR archive, new archiver from ARJ Software, Inc., see .J | |
| .JAR | Java ARchive, based on ZIP archives, used for fast downloading of Java applets in a single HTTP transaction | |
| .JAS | Bitmap image (JAS Compressed) | |
| .JASC | Image (JAS Compressed) | |
| .JAV | Java source code, see .JAVA | |
| .JAVA | Java source code Notepad | |
| .JBD | SigmaScan datafile | |
| .JBF | Jasc Browser File | PSP |
| .JBIG | Bitmap image (1-bit raster image) (Joint Bi-level Image experts Group file interchange format) | IM |
| .JBX | Project file (Project Scheduler 4) | |
| .JCM | Java Commerce Message | |
| .JET | Fax (Hybrid JetFax) | |
| .JFF | JPEG - JFIF Compliant bitmap image, see .JPEG | |
| .JFI | JPEG bitmap image | TP |
| .JFIF | JPEG image, see also JPG Mime: image/jpeg Mime(2): image/pjpeg | |
| .JIF | JPEG - JFIF Compliant bitmap image, see .JPEG | |
| .JIS | Japanese Industry Standard (text) | |
| .JMS | Music format (JMusic file) (UltraForce) | |
| .JN1 | Epic MegaGames Jill of the Jungle game data | |
| .JOB | Ms Scheduler Job object | |
| .JOI | Join conferences file (XBoard) | |
| .JOR | Journal file (Gupta SQLWindows) | |
| .JOU | Journal file (VAX Edt editor) | |
| .JPC | Bitmap image (Japan Picture format) | |
| .JPE | JPEG image Mime: image/jpeg | AV, GWS |
| .JPEG | JPEG - JFIF Compliant bitmap image, see .JPG | |
| .JPG | JPEG - JFIF Compliant bitmap image (JPEG= Joint Photographic Experts Group). Very high compression. Because of the small size it is often used on Internet Imaging Mime: image/jpeg | ACD, GWS, IM, IV, JIR, LVP, PSP, PV, QVP, SB, TP, TVP MAC: GC Win & Mac: QT Various: XNV |
| .JPN | JaPaNese documentation try Notepad | |
| .JRC | Compressed file archive (JRchive) | |
| .JS | JavaScript language source code file (script) Mime: application/x-javascript | |
| .JSM | Jigsaw file (JugWin) | |
| .JSS | Jigsaw file (JugWin) | |
| .JTF | TIFF 6.0 bitmap image using JPEG compression | |
| .JTF | Fax (Hayes JT Fax) | |
| .JUT | Jutvision scene | |
| .JW | JustWrite text document | |
| .JWL | Library (JustWrite) | |
| .JZZ | Jazz spreadsheet | |
| Up | ||
| Ext | Description | Goto Shareware |
| .K3D | Description of macro language (3DS) | |
| .KAR | KARaoke (MIDI music with word track) | |
| .KAR | Precompiled .prg for KARAT (Rus. FOX+ 2.0) | |
| .KB | Borland C++ 4.5 KeyBoard script | |
| .KB | Knowledge Pro program source | |
| .KBD | KeyBoarD mapping (LocoScript/Signature/Procomm Plus) | |
| .KBM | Reflection 4.0 KeyBoard Mapping | |
| .KCL | Lisp language source code file (Kyoto Common Lisp) | |
| .KDC | Kodak Digital Camera bitmap image (PhotoEnhancer) | GWS, IV, PSP |
| .KDK | Bitmap image (Kodak proprietary decimated TIFF format) | |
| .KEX | Kedit Macro | |
| .KEY | Security file eg. registration KEY | |
| .KEY | Archive .key-file (OS/2) | |
| .KEY | Forecast Pro datafile | |
| .KEY | KEYboard macros | |
| .KFX | KoFaX Group 4 image | |
| .KIT | Power Chords drum kit file | |
| .KML | Kedit Macro Library | |
| .KNN | Clarion database key file | |
| .KPP | Toolpad (SmartPad) | |
| .KPS | Ibm KIPS bitmap image | |
| .KQP | Bitmap image (Konica Quality Photos) | |
| .KRZ | Kurzweil K2000 File | |
| .KSH | Unix shell script (ksh) | |
| .KYB | Keyboard mapping (FTP Software PC/TCP) | |
| .KYE | Game data (Kye) | |
| Up | ||
| Ext | Description | Goto Shareware |
| .L | L-System fractal (Fractint) | |
| .L | Lex language source code file | |
| .L | Linker directive file (WATCOM wlink) | |
| .L | Lisp language source code file | |
| .LA | Netscape packetized audio (LiveAudio) | |
| .LAB | Datafile (NCSS/SOLO) | |
| .LAB | Mailing labels (Q+E for Ms Excel) | |
| .LAB | "Wasp Barcode Labeler" label file | |
| .LAM | Streaming audio metafile (Netscape Media Player) | |
| .LAN | Erdas true colour bitmap image | |
| .LAN | Novell NetWare LAN Drivers | |
| .LANDSAT | Bitmap image (EOSAT's Landsat Thematic Mapper data file) | |
| .LATEX | LaTeX text document | |
| .LAY | Word chart LAYout (APPLAUSE) | |
| .LBG | dBASE IV label generator data | |
| .LBL | LaBeL (dBASE IV/Clipper 5/dBFast) | |
| .LBM | Deluxe Paint bitmap image, like Amiga's IFF | ACD, GWS, IV, JIR, PSP, TP MAC: GC Various: XNV |
| .LBM | Linear BitMap image (XLib) | |
| .LBO | dBASE IV compiled label | |
| .LBR | Compressed file archive (LU) | |
| .LBR | Lotus 1-2-3 display driver | |
| .LBT | FoxPro additional (FPT) label description file | |
| .LBX | FoxPro main (DBF) label description file | |
| .LCF | Linker Control File (Norton Guides compiler) | |
| .LCH | IBM Works for OS/2 chart | |
| .LCK | LoCK file (especially for database access control) | |
| .LCL | Data (FTP Software PC/TCP) | |
| .LCN | WordPerfect lection | |
| .LCS | Datafile (ACT! History Files) | |
| .LCW | Spreadsheet (Lucid 3-D) | |
| .LD | Telix Long Distance codes file | |
| .LD1 | dBASE overlay file | |
| .LDB | Ms Access Record-Locking Information | |
| .LDB | Data filer database (IBM Works for OS/2) | |
| .LDF | Data filer form (IBM Works for OS/2) | |
| .LDF | Geoworks Library Definition File | |
| .LDI | LDIF file (address book interchange format) | |
| .LDIF | LDIF file (address book interchange format) | |
| .LE | Executable image (DOS/4GW PM 32X DOS Extender) | |
| .LEG | LEGacy document | |
| .LES | LESson (check *.cbt) | |
| .LEV | LEVel file (eg. NetHack 3.x) | |
| .LEX | LEXicon (dictionary) file. Many different formats used by various programs | |
| .LFD | LucasArts resource file (LucasArts games) | |
| .LFT | Laser printer font (ChiWriter) | |
| .LG | Compressed file archive (Arhangel) | |
| .LG | LoGo procedure definitions (LSRHS Logo) | |
| .LGC | Windows application log, used for optimizations | |
| .LGD | Windows application log, used for optimizations | |
| .LGE | Windows application log, used for optimizations | |
| .LGF | Windows application log, used for optimizations | |
| .LGO | LoGO for header and footer (SuperFax) | |
| .LGO | Windows 3.x startup LoGO code | |
| .LHA | Lempel Ziv Huffman archive Lha.exe | WC, WZ |
| .LHS | Literate Haskell source code file | |
| .LHW | Compressed Amiga file archive (LHWarp) | |
| .LHZ | Compressed file archive (LHA) | |
| .LIB | LIBrary file (several programming languages) | |
| .LIC | LICense file | |
| .LIF | Archive, used by Knowledge Dynamics' Install.exe | |
| .LIF | Compressed file archive (CA Clipper installer) | |
| .LIF | Logical Interchange Format data file (Hewlett-Packard) | |
| .LIM | Compressed file archive (Limit) | |
| .LIN | AutoCAD LINe types | |
| .LIN | Vector data (ARC format) | |
| .LIS | VAX LISting | |
| .LISPM | Bitmap image (Lisp Machine file) | |
| .LIT | Movie Mediaplayer | |
| .LIT | Microsoft Reader eBook Here you should find a viewer Mime: reader/x-lit .lit | |
| .LJ | Bitmap image (HP LaserJet graphics file) | |
| .LKU | T9000 linkable unit | |
| .LL3 | Laplink III related file (document) | |
| .LLB | National Instruments LabVIEW virtual library | |
| .LMA | Netscape packetized audio (LiveAudio) | |
| .LMP | Demo for Doom (3D PC game) | |
| .LN03 | Bitmap image (DEC LN03+ Sixel file) | |
| .LNG | Language definition file | |
| .LNG | Language extensions (Lahey Fortran) | |
| .LNK | Shortcut Windows 9x (LiNK) | |
| .LNK | Linker script (.RTLink) | |
| .LOC | Localisation string resource header file | |
| .LOD | Load file | |
| .LOF | Auxiliary file for List Of Figures (LaTeX) | |
| .LOG | Log File, mostly readable with Notepad | |
| .LOT | Auxiliary file for List Of Tables (LaTeX) | |
| .LP | Lightscape 3D Object | AT |
| .LPC | TEKO printer driver | |
| .LPC | Sound (Linear Predictive Coding) | |
| .LPD | Nuts and Bolts file (Helix) | |
| .LQT | Music (Liquid Audio) | |
| .LRC | Intel Video Phone file | |
| .LRF | Ms C/C++ Linker Response File | |
| .LRG | Macromedia xRes native (SGI Platforms) | |
| .LRP | IBM Works for OS/2 report | |
| .LRS | WordPerfect for Win Language ReSource file | |
| .LRT | Yacc log file | |
| .LSA | LightScape Technologies ASCII data | |
| .LSB | LightScape Technologies binary data | |
| .LSP | LiSP language source code file (AutoLISP/Xlisp) | |
| .LSS | Spreadsheet (Legato/IBM Works for OS/2) | |
| .LST | LiST text file Notepad | |
| .LST | 1st Reader keyboard macro | |
| .LST | LiSTing (e.g. source code) | |
| .LST | Oracle spool file | |
| .LTM | Bitmap image (EOSAT's Landsat Thematic Mapper data file) | |
| .LTM | Form (Lotus Forms) | |
| .LTR | This extension may have been created by the user himself and probably means LeTteR. It could have any Wordprocessor format like WP or Word, or just a plain text If you have problems opening it, you could try WhatFormat to figure out a proper extension and rename it accordingly | |
| .LTX | Mathematical text document (LaTeX) | |
| .LWD | LotusWorks text document | |
| .LWF | Luratech Wavelet | IV |
| .LWO | LightWave Objects file | AT, PT |
| .LWP | Lotus Word Pro document | |
| .LWP | IBM Works for OS/2 document | |
| .LWS | LightWave Scene file | PT |
| .LYR | Song LYRics (ASCII) | |
| .LZD | Difference file for binaries (Ldiff 1.20) | |
| .LZH | Lempel Ziv Huffman archive Lha.exe | FMV, WC, WZ |
| .LZS | Compressed file archive (LARC) | |
| .LZW | Compressed Amiga file archive (LHWarp) | |
| .LZX | Archive, often used on Amiga | |
| Up | ||
| Ext | Description | Goto Shareware |
| .M | Function and commands (Matlab M-file/Mathematica) | |
| .M | Common binary file name extension (Maple) | |
| .M | Macro module (Brief) | |
| .M | Objective-C language source code file (gcc) | |
| .M | Script file (Miranda programming language) | |
| .M | Standard package (Mathematica) | |
| .M11 | Sound (Farallon's MacRecorder format) (sampling rate 11k) | |
| .M11 | Text file (MASS11) | |
| .M1A | MPEG-1 audiostream | |
| .M1S | MPEG-1 systemstream | |
| .M1V | Moving Pictures Experts Group video (MPEG-1 IPB) Mime: video/mpeg | AV, CMW |
| .M2 | Modula 2 language source code file | |
| .M22 | Sound (Farallon's MacRecorder format) (sampling rate 22k) | |
| .M2A | MPEG-2 audio | |
| .M2V | MPEG-2 IPB videostream | |
| .M3 | Modula3 language source code file | |
| .M3A | MPEG-3 audio | |
| .M3D | Corel MOTION 3D Scene movie Mediaplayer | |
| .M3U | Playlist file Mime: audio/x-mpegurl | WA |
| .M4 | M4 preprocessor file (unix) | |
| .M7 | Sound (Farallon's MacRecorder format) (sampling rate 7k) | |
| .M_U | Backup of boot sector FAT and boot dir (MazeGold) | |
| .MA | Ascii file (notebook) (Mathematica) | |
| .MA | hDC products for MicroApp executable files | |
| .MA3 | Harvard Graphics 3.0 macro | |
| .MAC | MacPaint bitmap image, black & white, PackBits compressed. Also .PNT and .PNTG are used for this format | GWS, PSP, PV, QT, TVP Various: XNV |
| .MAC | MACro file Often readable with Notepad | |
| .MAC | Assembly Language file | |
| .MACP | Apple Macintosh MacPaint bitmap image | |
| .MAD | Ms Access Module Shortcut | |
| .MAF | Ms Access Form Shortcut | |
| .MAG | Woody Lynn's MAG graphics format (MPS Magro Paint System) | |
| .MAH | Mahjongg Solitaire settings | |
| .MAI | Mail message (VAX) | |
| .MAK | Project file used by some programming languages like Visual Basic, containing a list of source files Notepad | |
| .MAM | Ms Access Macro Shortcut | |
| .MAN | MANual (textfile) Notepad | |
| .MAP | Card document of Route 66 | |
| .MAP | ColorMAP intensities and indices color palette | IM |
| .MAP | Debug info used by some programming languages | |
| .MAP | Micrografx Picture Publisher format data | |
| .MAP | Atlas MapMaker geographical map | |
| .MAP | Linker map file | |
| .MAP | AccView network map | |
| .MAQ | Ms Access Query Shortcut | |
| .MAR | Ms Access Report Shortcut | |
| .MAR | Assembly program (VAX Macro) | |
| .MARM | Makefile for MARM platform (EPOC) | |
| .MAS | Lotus Freelance SmartMASter set | |
| .MAT | MATlab sound | GW |
| .MAT | Ms Access Table Shortcut | |
| .MAX | Max language source code file | |
| .MAX | Scene (3D Studio Max) | |
| .MAZ | Data (dVS/dVISE) | |
| .MAZ | Hover maze game data | |
| .MB | Paradox memo field values for database | |
| .MB | Binary file (bitmaps etc.) (Mathematica) | |
| .MB1 | Apogee Monster Bash game data | |
| .MBFAVS | Stardent AVS X bitmap image, see .AVS | |
| .MBFS | Stardent AVS X bitmap image, see .AVS | |
| .MBK | dBASE IV multiple index file backup | |
| .MBM | EPOC multi-bitmap file | |
| .MBX | MailBoX, used by many mail clients like Eudora or Outlook Express | |
| .MC | M3CG intermediate language file (Modula-3) | |
| .MC | Manual Chapter (NRC Inspection Manual) | |
| .MC$ | Magic Xchange package (Magic Cap file archive) | |
| .MCA | ModCA IOCA | SB |
| .MCC | Shortcut to The Microsoft Network CCDIALER | |
| .MCC | Mathcad configuration file | |
| .MCC | Dialer10 calling card | |
| .MCD | MathCaD file | |
| .MCF | Mathcad font file | |
| .MCF | Hotsauce graphics | |
| .MCI | Command script (Media Control Interface) | |
| .MCL | MultiEdit macro library | |
| .MCM | Enable Macro | |
| .MCP | Capsule application script | |
| .MCP | Composed Media multimedia file (NetMC Player) | |
| .MCP | Mathcad printer driver | |
| .MCS | MathCAD image | |
| .MCW | Text document (MacWrite II/MS Word for Macintosh) | |
| .MD | Compressed file archive (MDCD) | |
| .MD5 | Checksum file for .SHN audio, see there for more info | |
| .MDA | Ms Access Add-in | |
| .MDB | Ms Access DataBase | FMV (ODBC needed), QVP, WB |
| .MDE | MDE database (MS Access) | |
| .MDI | MIDI-sequention sound, see .MID | |
| .MDL | Geometrical model (3D Design Plus) | |
| .MDL | Object design model (Rational Rose 98) | |
| .MDL | Spreadsheet (CA-Compete!) | |
| .MDL | 3D Gamestudio model file | |
| .MDM | Modem definition (TELIX) | |
| .MDN | Ms Access Blank Database | |
| .MDP | Project workspace (MS Developer Studio) | |
| .MDR | Microdrive file (ZX Spectrum emulator) | |
| .MDT | Ms Access Add-in Data | |
| .MDT | Data table (Ms ILink incremental linker) | |
| .MDW | Ms Access Workgroup Information | |
| .MDX | Maintained dBASE database index | |
| .MDZ | Ms Access Database Wizard Template | |
| .MDZ | Description of music module (Cubic Player/Cross-View) | |
| .ME | As 'Read.me' a textfile probably describing an application Notepad | |
| .ME | Configuration (MultiEdit) | |
| .ME | Formatted manual page with me macros | |
| .ME! | As 'Read.me!' an urgent textfile probably describing an application Notepad | |
| .MEB | Macro Editor bottom overflow file (WordPerfect Library) | |
| .MEC | MECCA source (Maximus) | |
| .MED | Sound (Amiga MED/OctaMED Module) | |
| .MED | Macro Editor delete save (WordPerfect Library) | |
| .MEM | Macro Editor macro (WordPerfect Library) | |
| .MEM | Memory variable save file (Clipper/dBASE IV/FoxPro) | |
| .MEM | Clarion MEMos datafile | |
| .MEM | This extension may have been created by the user himself and probably means MEMo. It could have any Wordprocessor format like WP or Word, or just a plain text If you have problems opening it, you could try WhatFormat to figure out a proper extension and rename it accordingly | |
| .MEQ | Macro Editor print queue file (WordPerfect Library) | |
| .MER | Macro Editor resident area (WordPerfect Library) | |
| .MES | Macro Editor work space file (WordPerfect Library) | |
| .MES | MESsage | |
| .MET | OS/2 METafile | |
| .MET | Omnipage Pro document | |
| .MET | Macro Editor top overflow file (WordPerfect Library) | |
| .MEU | Menu group (DOS Shell) | |
| .MEX | Dynamically linked subroutines (Macintosh) (Matlab) | |
| .MEX | Macro Editor expound file (WordPerfect Library) | |
| .MEX4 | Dynamically linked subroutines (Sun-4/SPARC) (Matlab) | |
| .MEXDS | Dynamically linked subroutines (DECStation) (Matlab) | |
| .MEXHP3 | Dynamically linked subroutines (HP9000/series 300) (Matlab) | |
| .MEXHP7 | Dynamically linked subroutines (HP9000/series 700) (Matlab) | |
| .MEXN | Dynamically linked subroutines (NeXT) (Matlab) | |
| .MEXRS6 | Dynamically linked subroutines (IBM RS/6000) (Matlab) | |
| .MEXSG | Dynamically linked subroutines (SGI) (Matlab) | |
| .MF | Metafont text file (TeX) | |
| .MFD | Monadic functions (ABC programming language) | |
| .MFJ | MetaFont job (batch input) | |
| .MFM | Music format (DMP) | |
| .MFT | Style file (MetaFont source formatter) | |
| .MG | Modula-3 generic module source | |
| .MGF | ASCII-based 3D rendering Materials and Geometry Format | |
| .MGF | Micrografx font | |
| .MGR | MGR bitmap image | |
| .MGX | Micrografx Designer drawing | |
| .MHT | Message HTML file, see MHTML | |
| .MHTML | Message HTML file Explorer Mime: message/rfc822 | |
| .MI | MIscellaneous | |
| .MIB | SNMP MIB file | |
| .MIC | Microsoft Image Composer data | |
| .MID | MIDI-sequention sound (Musical Instrument Digital Interface) Media Player Mime: audio/midi Mime(2): audio/x-midi Mime(3): audio/mid | CMW, IV, WA |
| .MIDI | MIDI-sequention sound, see .MID | |
| .MIDS | Sound | WA |
| .MIF | Image Magick Image File Format, see .MIFF | |
| .MIF | FrameMaker data | |
| .MIF | PC system component DMI attributes (Management Information Format) | |
| .MIFF | Image Magick Image File Format | IM Various: XNV |
| .MII | MicroStat-II datafile | |
| .MIL | Raster graphics (CALS Group IV Type 2) | |
| .MIM | MIME encoded file | PKZ |
| .MIME | Message in MIME format (RFC822) | |
| .MIS | MISsion file (many games) | |
| .MITSU | Bitmap image (Mitsubishi S340-10 color sublimation printer file) | |
| .MIX | Ms Windows sound MIX | |
| .MIX | Power C object file | |
| .MIZ | Sound | WA |
| .MJF | Mjuice secure music file | WA |
| .MK | MaKefile | |
| .MKE | Ms Windows SDK MaKEfile | |
| .MKG | Makefile | |
| .MKI | Japanese graphics MAKIchan format (MagView 0.5) | |
| .MKS | TACT data | |
| .MKW | Michael K. Weise compressed audio file, no loss of quality as occurs with .MP3, but they are larger | |
| .ML | ML language source code file | |
| .ML3 | Milestones 3.x project | |
| .MLB | Symphony macro library file | |
| .MLI | Autodesk 3D Studio material file | PT |
| .MLM | Saved email (Novell GroupWise using WP5.1 format) | |
| .MM | MultiMate Advantage II text document | |
| .MM | Meme virtual reality world | |
| .MME | MIME encoded file | PKZ |
| .MMF | Mail Message File (Ms Mail) | |
| .MMM | MultiMedia Movie format (RIFF RMMP) (MacroMind Director 3.x) | |
| .MMO | MeMO writer file (RapidFile) | |
| .MMP | Output video format from Bravado board | |
| .MMP | makmake makefile project (EPOC) | |
| .MND | Cerious MaNDelbrot image | TP |
| .MND | Menu source (AutoCAD Menu Compiler) | |
| .MNG | Multiple-image Network Graphics bitmap image | IM |
| .MNG | Map (DeLorme Map'n'Go) | |
| .MNI | Cerious MaNDelbrot image | TP |
| .MNT | Additional (FPT) menu description file (FoxPro) | |
| .MNU | DOS mouse MeNU | |
| .MNU | HP NewWave advanced macro | |
| .MNX | AutoCAD compiled menu | |
| .MNX | Main (DBF) menu description file (FoxPro) | |
| .MNY | Ms Money account book | |
| .MO | Modula-3 object file | |
| .MOB | Device definition (PEN Windows) | |
| .MOCHA | Javascript Mime: application/x-javascript | |
| .MOD | Music (Amiga MODule format) (DMP/FastTracker/MDP/Protracker/Soundtracker) | WA |
| .MOD | Ms Multiplan spreadsheet | QVP |
| .MOD | File implementing DOS support for Windows DLL's | |
| .MOD | MODel definitions (EPOC) | |
| .MOD | Clarion Modula-2 language source code file | |
| .MOI | French textfile As Lisez.moi = Read.me in French | |
| .MOL | MDL Molfile | |
| .MON | MONitor description (ReadMail) | |
| .MOO | MoonRock language source code file | |
| .MOOV | Quicktime movie | |
| .MOOV | QTVR panorama | |
| .MOP | M.Fujimiya's MOrPher for Windows 1.4 work file | |
| .MOTIF | Microangelo Motif | |
| .MOV | Apple QuickTime MOVie, standard Macintosh video format Media Player Mime: video/quicktime | IV AV, CMW, GWS and TP require the QuickTime for Windows MCI drivers Win & Mac: QT |
| .MOV | Quicktime Virtual Reality | |
| .MOV | AutoCAD AutoFlix MOVie | |
| .MOZ | Netscape temporary cache file | |
| .MP | MultiPlan | |
| .MP | Movie (MPEG compressed) | |
| .MP1 | MPEG audio file | WA |
| .MP2 | Moving Pictures Experts Group Mime: video/x-mpeg2a Mime(2): video/x-mpeg | AV, CMW |
| .MP2 | Sound (MPEG-1 Layer II Audio Stream) Mime: audio/x-mpeg | WA |
| .MP2V | Moving Pictures Experts Group, see also .MP2 Mime: video/x-mpeg2 | |
| .MP3 | MPEG-1 Layer III Audio Stream (= highly compressed audio) Media Player Mime: audio/mpeg Mime(2): audio/basic | AH, AV, CDMP3, CMW, IV, WA Win & Mac: QT |
| .MPA | MPEG-1 sound, PCM digitized, high compression Mime: audio/x-mpeg | AV, CMW |
| .MPC | Ms Project Calendar file | |
| .MPD | Monadic predicates (ABC programming language) | |
| .MPE | MPEG movie (Motion Pictures Experts Group), see .MPG | |
| .MPEG | MPEG movie (Motion Pictures Experts Group), see .MPG | |
| .MPEGA | MPEG sound Mime: audio/x-mpeg | |
| .MPG | MPEG movie (Motion Pictures Experts Group), high compression Media Player Some MPEG software can be found here: PC, MAC, Unix Mime: video/mpeg | AV, CMW, GWS, IM, IV, RP Win & Mac: QT |
| .MPM | Mathplan macro (WordPerfect Library) | |
| .MPNT | MacPaint bitmap image, black & white, PackBits compressed, see .MAC | |
| .MPP | Project file (Ms Project) | |
| .MPR | FoxPro generated executable menu file | |
| .MPT | Multipage TIFF bitmap image | |
| .MPV | MPEG movie, no sound, also as .VBS Mime: video/mpeg | CMW |
| .MPV | Ms Project View file | |
| .MPV2 | Moving Pictures Experts Group, see .MP2 Mime: video/x-mpeg2 | |
| .MPX | FoxPro compiled executable menu file | |
| .MRB | Multiple Resolution Bitmap image (Ms C/C++) | |
| .MRC | Bibliographic data (Machine-Readable Cataloging records) | |
| .MRG | This extension may have been created by the user himself and probably means MeRGe file. It could have any Wordprocessor format like WP or Word, or just a plain text If you have problems opening it, you could try WhatFormat to figure out a proper extension and rename it accordingly | |
| .MRK | CSI MaRKup file (CAD format) | |
| .MRK | Windows 95 user benchmark | |
| .MRS | WordPerfect Macro ReSource | |
| CHKLIST.MS | MSAV report (Microsoft AntiVirus) | |
| .MS | Formatted manual page with ms macros | |
| .MS | Modula-3 intermediate assembly file | |
| .MS | Maple worksheet | |
| .MSC | Ms C makefile | |
| .MSDL | Manchester Scene Description Language, 3D rendering? | |
| .MSG | MeSsaGe text Notepad | |
| .MSN | Ms Network component | |
| .MSP | Ms Paint bitmap image | GWS, JIR, PSP, PV, TVP MAC: GC |
| .MSP | Windows installer Patch Msiexec.exe | |
| .MSS | Manuscript text file (Perfect Writer/Scribble/MINCE/Jove) | |
| .MSS | Sound | WA |
| .MST | Presentations | QVP |
| .MST | Ms Test document | |
| .MST | Minispecification file (Prosa) | |
| .MST | Ms Windows SDK setup script | |
| .MSW | Ms Word text document | |
| .MSX | Image format | MAC: GC |
| .MSX | Compressed CP/M file archive (MSX) | |
| .MTH | Derive MaTH file | |
| .MTL | Wavefront | |
| .MTM | MultiTracker Module music | WA |
| .MTV | MTV Raytracing image format | IM |
| .MTW | Minitab data file | |
| .MU | Quattro pro for DOS MenU definition | |
| .MUS | Sound file (MusicTime/Doom) | WA |
| .MVB | Ms Multimedia Viewer data | |
| .MVF | Stop frame file (AutoCAD AutoFlix) | |
| .MVI | Movie command file (AutoCAD AutoFlix) | |
| .MVP | MediaView Project | |
| .MVW | Saber LAN log file | |
| .MW | MacWrite II text document | |
| .MWF | ProMotion animation | |
| .MWII | MacWrite II text document | |
| .MWP | SmartMaster (Lotus Word Pro) | |
| .MX | Matlab common matrix routines | |
| .MX | Modula-3 linker information | |
| .MX3 | Dynamically linked subroutines (80386/486 Ms Windows) (Matlab) | |
| .MXL | PackRat 5.0 support file | |
| .MXT | Ms C data | |
| .MYP | Presentation (MM Make Your Point) |
Thanks to Jouni for allowing me to add his giant extension database to this list and WhatFormat
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