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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .FEI | Geoworks Ensemble | System Files | Geoworks Dependency Information File | GEOS (Graphic Environment Operating System) | Geoworks Ensemble |
| .FFA | Microsoft Corporation | System Files | Find Fast Status File | Microsoft Outlook | Microsoft Corporation |
| .FFO | Microsoft Corporation | System Files | Find Fast Document Properties Cache | Microsoft Outlook | Microsoft Corporation |
| .FFX | Adobe Systems Incorporated | System Files | After Effects Preset File | Adobe After Effects | Adobe Systems Incorporated |
| .FID | Microsoft Corporation | System Files | Windows Indexing Service File | Microsoft Windows | Microsoft Corporation |
| .FLG | Larry Short, Mick Amadio and Puppy community | System Files | Puppy Linux Partition Flag File | Puppy Linux | Larry Short, Mick Amadio and Puppy community |
| .FOLDER | Microsoft Corporation | System Files | Microsoft Windows Explorer Folder File | Microsoft Windows | Microsoft Corporation |
| .FPBF | Apple | System Files | Mac OS X Burn Folder | Apple OS X | Apple |
| .FS | Microsoft Corporation | System Files | Visual F# Source File | Microsoft Visual Studio | Microsoft Corporation |
| .FTG | Microsoft Corporation | System Files | Full Text Group | Microsoft Windows Help | Microsoft Corporation |
| .FTS | Microsoft Corporation | System Files | Full Text Search | Microsoft Windows Help | Microsoft Corporation |
| .FX | Microsoft Corporation | System Files | Direct3D Effects File | Microsoft Visual Studio | Microsoft Corporation |
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