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