| .F&F | Unknown Developer | Fichiers divers | Netmino File | Netmino | Unknown Developer |
| .F0A | Unknown Developer | Fichiers divers | Unknown File Type | Unknown Software | Unknown Developer |
| .F1C | Unknown Developer | Fichiers divers | Unknown File Type | Unknown Software | Unknown Developer |
| .F3 | Unknown Developer | Fichiers divers | FLASH BIOS File | Unknown Software | Unknown Developer |
| .F99 | U.S. Army Corps of Engineers | Fichiers divers | Flow File | HEC-RAS | U.S. Army Corps of Engineers |
| .FBA | Unknown Developer | Fichiers divers | Mamew20 Data File | Mamew20 | Unknown Developer |
| .FCE | EaSynth Solution | Fichiers divers | ForeUI Custom Element File | EaSynth Solution ForeUI | EaSynth Solution |
| .FCG | Sublime HQ Pty Ltd | Fichiers divers | FastCGI Script File | Coda | Panic |
| .FDCSS | Unknown Developer | Fichiers divers | Unknown File Type | Unknown Software | Unknown Developer |
| .FDR | Final Draft | Fichiers divers | Final Draft Document | Final Draft | Final Draft |
| .FDV | Unknown Developer | Fichiers divers | Unknown File Type | Unknown Software | Unknown Developer |
| .FEF | Unknown Developer | Fichiers divers | Steuer 2001 File | Steuer2001 | Unknown Developer |
| .FEL | Unknown Developer | Fichiers divers | Uncommon File Extension | Unknown Software | Unknown Developer |
| .FGX | Unknown Developer | Fichiers divers | Formula Graphics Project File | Formula Graphics | Unknown Developer |
| .FHC | Canute LLP | Fichiers divers | FHC Data File | Canute FHC | Canute LLP |
| .FILE | Unknown Developer | Fichiers divers | Generic Windows File | Unknown Software | Unknown Developer |
| .FIQ | Unknown Developer | Fichiers divers | Unknown File Type | Unknown Software | Unknown Developer |
| .FIXED | Unknown Developer | Fichiers divers | DLLbackup Root File | Unknown Software | Unknown Developer |
| .FJO | Unknown Developer | Fichiers divers | Unknown File Type | Unknown Software | Unknown Developer |
| .FLF | Microsoft Corporation | Fichiers divers | Microsoft Dynamics NAV License File | Microsoft Dynamics NAV (Navision) | Microsoft Corporation |
| .FLK | Acclivity LLC | Fichiers divers | AccountEdge Company Lock File | AccountEdge Pro | Acclivity LLC |
| .FLYS | Redbug Technologies | Fichiers divers | Streaming Tour | Mapwing | Redbug Technologies |
| .FND | Microsoft Corporation | Fichiers divers | Windows Saved Search File | Microsoft Windows | Microsoft Corporation |
| .FPF | Inter IKEA Systems B.V. | Fichiers divers | IKEA Home Planner File | IKEA Home Planner | Inter IKEA Systems B.V. |
| .FPK | Interscape | Fichiers divers | Civilization 4 Data File | Take-Two Interactive Civilization 3 | Interscape |
| .FR12 | Unknown Developer | Fichiers divers | Unknown File Type | Unknown Software | Unknown Developer |
| .FR6 | Unknown Developer | Fichiers divers | Unknown File Type | Unknown Software | Unknown Developer |
| .FRK | Prosoft Engineering, Inc. | Fichiers divers | Macintosh Resource Or Data Fork | ProSoft Engineering Data Rescue | Prosoft Engineering, Inc. |
| .FRM | Oracle Corporation | Fichiers divers | MySQL Database Format File | MySQL | Oracle Corporation |
| .FRZ | Snes9x Team | Fichiers divers | Snes9x Saved State | Snes9x | Snes9x Team |
| .FSE | Unknown Developer | Fichiers divers | Unknown File Type | Unknown Software | Unknown Developer |
| .FTF | Sony | Fichiers divers | Sony Ericsson Xperia Android Firmware | Google Android | Google |
| .FTO | ASPEL DE MEXICO | Fichiers divers | Sistemas Administrativos File | Sistemas Administrativos | ASPEL DE MEXICO |
| .FUQ | Unknown Developer | Fichiers divers | Unknown File Type | Unknown Software | Unknown Developer |
| .FUS | FXpansion Audio UK Ltd. | Fichiers divers | GURU Uninstall Script | GURU | FXpansion Audio UK Ltd. |
| .FW | Selections & Functions | Fichiers divers | Framework Database | Framework | Selections & Functions |
| .FWI | Hewlett-Packard | Fichiers divers | PhotoSmart 850 Digital Camera File | PhotoSmart 850 Digital Camera | Hewlett-Packard |
| .FYB | Unknown Developer | Fichiers divers | Bold Font File | Fontasy Publisher | Unknown Developer |
| .G00 | Key Metric Software | Fichiers divers | Clannad Picture Image | Clannad | Key Technology, Inc. |
| .G3L | Unknown Developer | Fichiers divers | Uncommon File Extension | Unknown Software | Unknown Developer |
| .G8A | Unknown Developer | Fichiers divers | Unknown File Type | Unknown Software | Unknown Developer |
| .GAMDB00P | Unknown Developer | Fichiers divers | Unknown File Type | Unknown Software | Unknown Developer |
| .GAP | Ulead Systems | Fichiers divers | PhotoImpact Pencil Style Data | PhotoImpact | Corel |
| .GAU | Microsoft Corporation | Fichiers divers | Flight Simulator Gauge File | Microsoft Flight Simulator | Microsoft Corporation |
| .GEOM | Unknown Developer | Fichiers divers | AVS Application Visualization System File | Unknown Software | Unknown Developer |
| .GERMAN | Unknown Developer | Fichiers divers | Unknown Apple II Data File | Unknown Software | Unknown Developer |
| .GG | Google | Fichiers divers | Google Desktop Gadget File | Google Desktop | Google |
| .GIF_ | Unknown Developer | Fichiers divers | GIF Image Filter Databgif File | Unknown Software | Unknown Developer |
| .GKNOTE | Unknown Developer | Fichiers divers | Unknown File Type | Unknown Software | Unknown Developer |
| .GLJ | Unknown Developer | Fichiers divers | Uncommon File Extension | Unknown Software | Unknown Developer |
| .GLX | Unknown Developer | Fichiers divers | Uncommon File Extension | Unknown Software | Unknown Developer |
| .GM | GameMonkey | Fichiers divers | GameMonkey Script | Microsoft Notepad | Microsoft Corporation |
| .GM4 | New World Computing | Fichiers divers | Heroes Of Might & Magic III Saved Game | Heroes of Might & Magic III | Ubisoft |
| .GOD | 4D, Inc | Fichiers divers | Gore Game Data File | Gore: Ultimate Soldier | 4D, Inc |
| .GON | Unknown Developer | Fichiers divers | Unknown File Type | Unknown Software | Unknown Developer |
| .GOV | Unknown Developer | Fichiers divers | Netmino File | Netmino | Unknown Developer |
| .GP4 | Arobas Music | Fichiers divers | Guitar Pro 4 Tablature | TuxGuitar | Julian Gabriel Casadesus and Others |
| .GPG | Free Software Foundation | Fichiers divers | GNU Privacy Guard Public Keyring | GNU Privacy Guard | GNU Project |
| .GSFX | Unknown Developer | Fichiers divers | Unknown File Type | Unknown Software | Unknown Developer |
| .GSP | Ipswitch, Inc. | Fichiers divers | IMail Error Message File | Ipswitch IMail Server | Ipswitch, Inc. |
| .GW3 | DigiSoft Innovations | Fichiers divers | An Unknown Apple II File | Golden Orchard | DigiSoft Innovations |
| .GWQA | Unknown Developer | Fichiers divers | Unknown File Type | Unknown Software | Unknown Developer |
| .GYS | Unknown Developer | Fichiers divers | Unknown File Type | Unknown Software | Unknown Developer |
| .GZ0 | Unknown Developer | Fichiers divers | Unknown File Type | Unknown Software | Unknown Developer |
| .GZQUAR | SoftWinter | Fichiers divers | BitDefender Quarantined Data | BitDefender | Bitdefender |
| .H1 | Unknown Developer | Fichiers divers | Unknown File Type | Unknown Software | Unknown Developer |
| .H19 | DigiSoft Innovations | Fichiers divers | An Unknown Apple II File | Golden Orchard | DigiSoft Innovations |
| .H1Q | Microsoft Corporation | Fichiers divers | Microsoft Help Merged Query Index | Windows XP | Microsoft Corporation |
| .HAI | Unknown Developer | Fichiers divers | Ntgraph Nt09b-2b Emx Lib File | Unknown Software | Unknown Developer |
| .HAL | HansaWorld | Fichiers divers | HansaWorld Enterprise HAL Code File | HansaWorld Enterprise | HansaWorld |
| .HAV | Haenlein-Software | Fichiers divers | Video Recorder Video Data | DVR-Studio | Haenlein-Software |
| .HBQ | Unknown Developer | Fichiers divers | Uncommon File Extension | Unknown Software | Unknown Developer |
| .HDK | Matthew Bender | Fichiers divers | HotDocs Registration File | HotDocs | Matthew Bender |
| .HDX | Autodesk, Inc. | Fichiers divers | Delphi MultiHelp Index File | Autodesk AutoCAD | Autodesk, Inc. |
| .HDXI | Huawei | Fichiers divers | HedEx Lite File | HedEx Lite | Huawei |
| .HER | Unknown Developer | Fichiers divers | Unknown File Type | Unknown Software | Unknown Developer |
| .HJD | Unknown Developer | Fichiers divers | Uncommon File Extension | Unknown Software | Unknown Developer |
| .HKP | Mentor Graphics | Fichiers divers | Mentor Graphics Database | PADS | Mentor Graphics |
| .HLX | Advanced Micro Devices, Inc. | Fichiers divers | ATI Radeon Video Driver Support File | ATI Catalyst | Advanced Micro Devices, Inc. |
| .HMX | EC Software | Fichiers divers | Help & Manual 4 Project | Help & Manual | EC Software |
| .HNB | Unknown Developer | Fichiers divers | Unknown File Type | Unknown Software | Unknown Developer |
| .HNQ | Unknown Developer | Fichiers divers | Hunter File | Unknown Software | Unknown Developer |
| .HNT | Unknown Developer | Fichiers divers | Hunter CSV Based Collections | Unknown Software | Unknown Developer |
| .HNY | Unknown Developer | Fichiers divers | Unknown File Type | Unknown Software | Unknown Developer |
| .HOX | Unknown Developer | Fichiers divers | Uncommon File Extension | Unknown Software | Unknown Developer |
| .HP5 | Unknown Developer | Fichiers divers | Unknown File Type | Unknown Software | Unknown Developer |
| .HP8 | Hewlett-Packard | Fichiers divers | NewWave Write Text File | HP NetWave Write | Hewlett-Packard |
| .HP?= | Unknown Developer | Fichiers divers | Unknown File Type | Unknown Software | Unknown Developer |
| .HPDATA | Unknown Developer | Fichiers divers | Unknown File Type | Unknown Software | Unknown Developer |
| .HPH | Unknown Developer | Fichiers divers | Designer Graphics System 2 Data File | Designer Graphics System 2 | Unknown Developer |
| .HQB | Unknown Developer | Fichiers divers | Unknown File Type | Unknown Software | Unknown Developer |
| .HRYX | Unknown Developer | Fichiers divers | Unknown File Type | Unknown Software | Unknown Developer |
| .HS | Open Source | Fichiers divers | Haskell Script | MacroMates TextMate | MacroMates |
| .HT_ | Half-Baked Software | Fichiers divers | Hot Potatoes File | Hot Potatoes | Half-Baked Software |
| .HUA | Unknown Developer | Fichiers divers | Unknown File Type | Unknown Software | Unknown Developer |
| .HVT | Unknown Developer | Fichiers divers | Unknown File Type | Unknown Software | Unknown Developer |
| .HWA | Unknown Developer | Fichiers divers | Uncommon File Extension | Unknown Software | Unknown Developer |
| .HWK | Unknown Developer | Fichiers divers | Uncommon File Extension | Unknown Software | Unknown Developer |
| .HX_ | Unknown Developer | Fichiers divers | Unknown File Type | Unknown Software | Unknown Developer |
| .HYB | Unknown Developer | Fichiers divers | Uncommon File Extension | Unknown Software | Unknown Developer |
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