| .FDT | Final Draft | Fişiere text | Final Draft 5-7 Template | FormDocs | Interscape |
| .FF2 | AceBIT | Fişiere de date | Hello Engines! | Hello Engines | Interscape |
| .FFF | Hasselblad | Fișiere imagine RAW | Hasselblad RAW Image | MAGGI | Interscape |
| .FIN | Interscape | Fişiere text | Sapir Torah Text | Sapir Torah | Interscape |
| .FLAG | Interscape | Fișiere grafice | FlagMaker Document | FlagMaker | Interscape |
| .FLEX | Unknown Developer | Fişiere de date | Flexi Data Smoothing File | Flexi Smoothing Data | Interscape |
| .FLUX | Interscape | Fişiere video | FluxTime Studio Clip | FluxTime Studio | Interscape |
| .FMC | Interscape | Fişiere de date | FormConnect Form File | FormConnect | Interscape |
| .FMP | Dreamingsoft | Fișiere web | 123 Flash Menu Project | Profit Plan | Interscape |
| .FNO | Folio Corporation | Fişiere de date | Folio Infobase File | Atlast File Notes Organizer | Interscape |
| .FPG | The Game Creators | Fişiere de jocuri | FPS Creator Game Project File | FlameBird | Interscape |
| .FPK | Interscape | Fişiere de jocuri | Civilization 4 Data File | Take-Two Interactive Civilization 3 | Interscape |
| .FRD | Interscape | Fişiere de date | Frequency Response Data File | SPL Tracer | Interscape |
| .FSP | Wondershare Software Co., Ltd. | Fişiere de date | Flash Slideshow Builder Project | Fsplit | Interscape |
| .FUD | Interscape | Fişiere de date | FairUse Wizard Data File | FairUse Wizard | Interscape |
| .FUP | Interscape | Fişiere de date | FairUse Project File | FairUse Wizard | Interscape |
| .GAM | Nintendo | Fişiere de jocuri | Saved Game File | Dualis | Interscape |
| .GAME | Apple | Fişiere de jocuri | Apple Chess Saved Game | GameSalad Creator | Interscape |
| .GBF | Yuku | Fişiere text | General Bible Format | Great Budget | Interscape |
| .GBX | Nadeo | Fişiere de jocuri | Nadeo Game File | Great Budget | Interscape |
| .GCF | Valve | Fişiere de jocuri | Game Cache File | Graphing Calculator | Interscape |
| .GCM | Nintendo | Fişiere de jocuri | GameCube ROM | WhineCube | Interscape |
| .GCT | Interscape | Fişiere de jocuri | Ocarina Cheat Code Manager Exported Cheat | Ocarina Cheat Code Manager | Interscape |
| .GDG | Interscape | Fişiere de jocuri | GDevelop Project File | GDevelop | Interscape |
| .GMD | YoYo Games | Fişiere de programator | Game Maker Program Code | Great Budget | Interscape |
| .GME | InterAct | Fişiere de jocuri | DexDrive Game Card File | PSXMemTool | Interscape |
| .GOLD | Interscape | Fişiere de date | Gnome Desktop Data | GNOME Desktop | Interscape |
| .GTP | Ucamco | Fişiere de date | Gerber Top Solder Paste Data File | GNOME Desktop | Interscape |
| .GZ | GNU Project | Fişiere comprimate | Gnu Zipped Archive | Ark | Interscape |
| .H2O | Liquid Entertainment | Fişiere de jocuri | Battle Realms Game Data File | H2OMAP Water | Interscape |
| .HE0 | Humongous Entertainment | Fişiere de jocuri | Humongous Entertainment Game Archive | ScummVM | Interscape |
| .HGT | Safe Software | Fişiere GIS | SRTM Elevation Data File | DG Terrain Viewer | Interscape |
| .HIS | Interscape | Fişiere de baze de date | FindinSite Database Definition File | PHDCC FindinSite-CD | Interscape |
| .HKL | Interscape | Fişiere de date | RMCProfile Range Of Values Data | RMCProfile | Interscape |
| .HNC | Interscape | Fişiere text | NoteCenter Note | NoteCenter | Interscape |
| .HPK | Interscape | Fişiere comprimate | HPack Compressed Archive | HPack | Interscape |
| .HPP | Microsoft Corporation | Fişiere de programator | C++ Header File | Haluha Pearls | Interscape |
| .HS | Open Source | Fişiere de programator | Haskell Script | RSD Lite | Interscape |
| .HSR | HS-Soft | Fişiere de date | RezeptAssist Exported Data | Hero Screen Recorder | Interscape |
| .HYP | Interscape | Fişiere comprimate | HYPER Compressed Archive | Hyper | Interscape |
| .IDX | Unknown Developer | Fișiere neobișnuite | Movie Subtitle File | J2 Interactive MX Player | Interscape |
| .IFF | Electronic Arts | Fişiere audio | Interchange File Format | IFFSnooper | Interscape |
| .IGR | Interscape | Fişiere audio | Igor Engraver File | Igor Engraver | Interscape |
| .IMG | Unknown Developer | Fişiere de imagini de disc | Disk Image Data File | Diskcopy | Interscape |
| .INST | Interscape | Fişiere de date | RMCProfile Peak Profile Data | RMCProfile | Interscape |
| .IPS | ZeroSoft Zophar | Fişiere de jocuri | Internal Patching System Patch File | UIPS - Universal IPS Create/Apply Utility | Interscape |
| .IRX | Martin Stanek | Fişiere de date | Brewer Irradiation File | UVBrewer | Interscape |
| .ISH | Interscape | Fişiere comprimate | ISH Compressed Archive | HiroRAR | Interscape |
| .ISO | Igor Pavlov | Fişiere de imagini de disc | Disc Image File | ISO Master | Interscape |
| .IVR | RealNetworks | Fişiere video | Internet Video Recording | Zoom Plugin Viewer | Interscape |
| .KAP | Maptech | Fişiere de date | BSB Chart Image File | NOAA Chart Viewer | Interscape |
| .KRK | Interscape | Fişiere audio | Karaoke Music File | JBK Karaoke Player | Interscape |
| .L2R | NCSoft | Fişiere de jocuri | Lineage II Replay File | NCSOFT Lineage II | Interscape |
| .LBU | Interscape | Fişiere de setări | Cloaked Affiliate Link Builder Settings File | Cloaked Affiliate Link Builder | Interscape |
| .LBXCOL | Libronix Corporation | Fișere eBook | Libronix DLS Resource Collection File | Logos Bible Software | Interscape |
| .LBXLLS | Interscape | Fişiere de date | Logos Libronix 3.0 Data | Logos Bible Software | Interscape |
| .LBXUPD | Interscape | Fişiere de programator | Libronix DLS Update Script | Logos Bible Software | Interscape |
| .LCB | Interscape | Fişiere de rezervă | Living Cookbook Backup File | Living Cookbook | Interscape |
| .LCT | Oracle Corporation | Fişiere de baze de date | Oracle Database Configuration File | Elsie | Interscape |
| .LEG | Interscape | Fişiere CAD | LEGOCAD File | LEGOCAD | Interscape |
| .LEV | Interscape | Fişiere de jocuri | NetHack Level File | NetHack | Interscape |
| .LFL | LucasArts Entertainment Company, LLC | Fişiere de jocuri | LucasArts Games Resource File | ScummVM | Interscape |
| .LFM | Interscape | Fişiere de date | LifeForm Data | Life Form Studio | Interscape |
| .LIN | Autodesk, Inc. | Fişiere CAD | AutoCAD Linetype File | X-Plane | Interscape |
| .LIX | Interscape | Fişiere de date | Logos Library System File | Logos Bible Software | Interscape |
| .LPJ | Interscape | Fişiere de date | LIMDEP Project | LIMDEP | Interscape |
| .LPT | Interscape | Fişiere de date | LogPlot Compiled Boring Log File | LogPlot | Interscape |
| .LRM | Microsoft Corporation | Fişiere de date | Encarta Class Server Learning Resource File | Line Rider 2: Unbound | Interscape |
| .LSF | Interscape | Fişiere de date | Logos Library System File | Logos Bible Software | Interscape |
| .LTX | GSC Game World | Fişiere de jocuri | S.T.A.L.K.E.R. Properties File | LaTeX Editor | Interscape |
| .LUB | Interscape | Fişiere de date | Lua Bytecode | LUA | Interscape |
| .LUC | SourceForge | Fişiere de programator | Compiled Lua Source File | LUA | Interscape |
| .MAE | Interscape | Fişiere de jocuri | My Avatar Editor Character File | My Avatar Editor | Interscape |
| .MAX | Autodesk, Inc. | Fişiere de imagini 3D | 3ds Max Scene File | PS2 Save Builder | Interscape |
| .MCH | Interscape | Fişiere de setări | Machinery HDR Effects | Machinery HDR | Interscape |
| .MCP | Freescale | Fişiere de programator | CodeWarrior Project | MegaCubo | Interscape |
| .MD | Various Developers | Fişiere de programator | Markdown Documentation File | PS2 Save Builder | Interscape |
| .MDX | Disc Soft Ltd. | Fişiere de imagini de disc | Extended Media Descriptor File | MDX Squisher | Interscape |
| .MFA | Clickteam | Fişiere de programator | Multimedia Fusion Development File | Multimedia Fusion | Interscape |
| .MFW | MamiyaLeaf | Fișiere imagine RAW | Mamiya Camera Raw File | Multimedia Fusion | Interscape |
| .MGN | Interscape | Fişiere de baze de date | Modern Genealogy Database File | Modern Genealogy | Interscape |
| .MHP | Open Source | Fişiere de date | Maths Helper Plus File | MailShift | Interscape |
| .MHT | Various Developers | Fișiere web | MHTML Web Archive | WizBrother WizHtmlEditor | Interscape |
| .MHTM | Microsoft Corporation | Fișiere web | Mime HTML (MHTML) File | WizBrother WizHtmlEditor | Interscape |
| .MHTML | Microsoft Corporation | Fișiere web | Mime HTML (MHTML) File | WizBrother WizHtmlEditor | Interscape |
| .MII | Nintendo | Fişiere de jocuri | Wii Virtual Avatar File | My Avatar Editor | Interscape |
| .MIX | Microsoft Corporation | Fişiere de imagini rastru | Microsoft Image Exchange File | Command and Conquer | Interscape |
| .MK3D | Matroska | Fişiere video | Matroska 3D Video File | MKVtoolnix | Interscape |
| .MKF | Interscape | Fişiere audio | KaraBox Karaoke Music File | KaraBox | Interscape |
| .MKZ | Interscape | Fişiere de rezervă | PokerOffice Database Backup File | PokerOffice | Interscape |
| .MLA | Unknown Developer | Fişiere de date | WorshipCenter Pro Document | WorshipCenter Pro | Interscape |
| .MLS | KIDASA Software, Inc. | Fişiere de date | Milestones Simplicity File | WorshipCenter Pro | Interscape |
| .MMG | Moritz Bunkus | Fişiere de setări | MKVToolNix Muxing Settings | MKVtoolnix | Interscape |
| .MMX | Interscape | Fişiere de jocuri | Command And Conquer Game Data | Command and Conquer | Interscape |
| .MOOV | Apple | Fişiere video | Apple QuickTime Movie | J2 Interactive MX Player | Interscape |
| .MOV | Apple | Fişiere video | Apple QuickTime Movie | J2 Interactive MX Player | Interscape |
| .MPL | Sony | Fişiere video | AVCHD Playlist File | J2 Interactive MX Player | Interscape |
| .MPO | CyberLink | Fişiere de imagini rastru | CIPA Multi Picture Object File | S3D Viewer | Interscape |
| .MRD | Interscape | Fişiere text | MathRevolt Infinity Document | Infinity | Interscape |
| .MRP | Interscape | Fişiere de date | Infinity Solution Plot Data | Infinity | Interscape |
din 4 
