| .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 |
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