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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .F2K | Microsoft Corporation | Game Files | Freecell 2000 File | Freecell 2000 | Microsoft Corporation |
| .FAC | Newera Software Technology, Inc. | Game Files | FACE Graphic File | Graphics Converter Pro | Newera Software Technology, Inc. |
| .FAM | Electronic Arts | Game Files | The Sims Family Data Game File | The Sims | Electronic Arts |
| .FAR | Electronic Arts | Game Files | The Sims Archive File | Dragon UnPACKer | Open Source |
| .FBI | Cavedog | Game Files | Total Annihilation Main Unit Definition File | Total Annihilation | Cavedog |
| .FCE | EaSynth Solution | Game Files | ForeUI Custom Element File | EaSynth Solution ForeUI | EaSynth Solution |
| .FCM | fcraft.net | Game Files | fCraft World File | fCraft | fcraft.net |
| .FCR | Michigan Department of Community Health | Game Files | Cost Report Data File | Electronic Cost Report for Microsoft Excel | Michigan Department of Community Health |
| .FCS | Interscape | Game Files | Flow Cytometry Standard File | Verity Software House V-Comp | Interscape |
| .FDS | Adobe Systems Incorporated | Game Files | JetForm FormFlow Data File | JetForm FormFlow | Adobe Systems Incorporated |
| .FF | Activision | Game Files | Call Of Duty 4 Fast File | Call of Duty 4: Modern Warfare | Activision |
| .FF7 | Square Enix | Game Files | Final Fantasy VII Saved Game | Final Fantasy | Square Enix |
| .FFD | Microsoft Corporation | Game Files | SharePoint FFDDumper Log | Microsoft Notepad | Microsoft Corporation |
| .FFN | Electronic Arts | Game Files | FIFA World Cup Game Data Fe Art Data | FIFA World Cup | Electronic Arts |
| .FGD | Valve | Game Files | Forge Game Data File | Valve Source SDK | Valve |
| .FIG | Open Source | Game Files | Xfig Drawing | Winfig | Andreas Schmidt |
| .FL | Microsoft Corporation | Game Files | Freelancer Saved Game File | Freelancer | Microsoft Corporation |
| .FLD | Open Source | Game Files | YSFLIGHT Field File | YSFlight | Open Source |
| .FML | Headlight Software | Game Files | GetRight File Mirror List | GetRight | Headlight Software |
| .FORGE | Ubisoft | Game Files | Assassin's Creed Game Data File | Assassin's Creed | Ubisoft |
| .FOS | Bethesda Softworks | Game Files | Fallout 3 Saved Game | Fallout 3 | Bethesda Softworks |
| .FOW | FormalSoft, Inc. | Game Files | Family Origins Database | Family Origins | FormalSoft, Inc. |
| .FOX | Dragon's Eye Productions | Game Files | Furcadia Art File | Furcadia | Dragon's Eye Productions |
| .FP2 | Piotr Fusik | Game Files | Funpaint Picture Image | Recoil | Piotr Fusik |
| .FPG | The Game Creators | Game Files | FPS Creator Game Project File | FBS Creator | The Game Creators |
| .FPK | Interscape | Game Files | Civilization 4 Data File | Take-Two Interactive Civilization 3 | Interscape |
| .FPP | The Eclipse Foundation | Game Files | Fortran Source Code | MacroMates TextMate | MacroMates |
| .FPS | The Game Creators | Game Files | FPS Creator Segment File | FPS Creator | The Game Creators |
| .FRA | Electronic Arts | Game Files | FIFA World Cup Game Data | FIFA World Cup | Electronic Arts |
| .FRC | Dovetail Games | Game Files | FS Recorder File | FS Recorder | Unknown Developer |
| .FRM | Oracle Corporation | Game Files | MySQL Database Format File | MySQL | Oracle Corporation |
| .FRW | Atari Corporation | Game Files | RollerCoaster Tycoon Fireworks Source Data | RollerCoaster Tycoon | Chris Sawyer |
| .FRZ | Snes9x Team | Game Files | Snes9x Saved State | Snes9x | Snes9x Team |
| .FS2 | Interplay Entertainment | Game Files | FreeSpace 2 Saved Mission File | Interplay FreeSpace 2 | Interplay Entertainment |
| .FSC | ProFantasy Software Ltd | Game Files | Campaign Cartographer File | Campaign Cartographer 3 | ProFantasy Software Ltd |
| .FSG | Open Source | Game Files | FreeCol Saved Game File | FreeCol | Open Source |
| .FSK | Atari Corporation | Game Files | Atari 8-bit Cassette Image | A8CAS | SourceForge |
| .FST | Image-Line | Game Files | FL Studio State File | Image-Line FL Studio | Image-Line |
| .FTL | Apache Software Foundation | Game Files | FreeMarker Template File | FreeMaker | Apache Software Foundation |
| .FUK | Running With Scissors | Game Files | Postal 2 Map File | Postal 2 | Running With Scissors |
| .FXT | Rockstar Games | Game Files | Grand Theft Auto Fake Text File | Sanny Builder | Open Source |
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