| .FAM | Electronic Arts | Settings Files | The Sims Family Data Game File | The Sims | Electronic Arts |
| .FAN | AutoDesSys, Inc. | Settings Files | Form•Z Animation File | AutoDesSys formZ | AutoDesSys, Inc. |
| .FAP | ACD Systems | Settings Files | ACD FotoAngelo Project | ACD FotoAngelo | ACD Systems |
| .FAT | Open Source | Settings Files | Zinf Theme File | Zinf Audio Player | Open Source |
| .FAV | Microsoft Corporation | Settings Files | Microsoft Outlook Bar-Shortcut | Microsoft Outlook | Microsoft Corporation |
| .FC | OpenText | Settings Files | FirstClass Settings File | OpenText FirstClass | OpenText |
| .FCC | Netegrity | Settings Files | Forms Credential Collector File | Netegrity SiteMinder | IBM |
| .FCM | fcraft.net | Settings Files | fCraft World File | fCraft | fcraft.net |
| .FD | Data Access Worldwide | Settings Files | DataFlex Data File | DataFlex | Data Access Worldwide |
| .FDC | Autodesk, Inc. | Settings Files | AutoCAD Field Catalog File | Autodesk AutoCAD | Autodesk, Inc. |
| .FEQ | Open Source | Settings Files | SuperEQ Equalizer Settings | Foobar2000 | Piotr Pawlowski |
| .FEV | Firelight Technologies | Settings Files | FMOD Audio Events File | Firelight Technologies FMOD Designer | Firelight Technologies |
| .FFX | Adobe Systems Incorporated | Settings Files | After Effects Preset File | Adobe After Effects | Adobe Systems Incorporated |
| .FGA | WinAbility Software | Settings Files | Folder Guard Attributes | Folder Guard | WinAbility Software |
| .FGM | Autodesk, Inc. | Settings Files | 3ds Max Final Gather Map File | Autodesk 3ds Max | Autodesk, Inc. |
| .FHX | Emerson | Settings Files | DeltaV Configuration | DeltaV | Emerson |
| .FI | Microsoft Corporation | Settings Files | Fortran Interface Data | Fortran | IBM |
| .FIG | Open Source | Settings Files | Xfig Drawing | Winfig | Andreas Schmidt |
| .FIN | Interscape | Settings Files | Sapir Torah Text | Sapir Torah | Interscape |
| .FIO | Adobe Systems Incorporated | Settings Files | PhotoStyler Graphics Filter | Aldus PhotoStyler | Adobe Systems Incorporated |
| .FIV | Forensic Innovations | Settings Files | File Investigator Database | File Investigator | Forensic Innovations |
| .FLD | Open Source | Settings Files | YSFLIGHT Field File | YSFlight | Open Source |
| .FLE | Unknown Developer | Settings Files | Scanner Settings File | Unknown Software | Unknown Developer |
| .FLT | Presagis | Settings Files | OpenFlight Scene Description File | ESRI ArcGIS for Desktop | ESRI (Environmental Systems Research Institute) |
| .FLX | Autodesk, Inc. | Settings Files | FLIC Animation | Apple QuickTime Player | Apple |
| .FM3 | IBM | Settings Files | Lotus 1-2-3 Spreadsheet Format File | Microsoft Excel | Microsoft Corporation |
| .FMB | Oracle Corporation | Settings Files | Oracle Forms Binary Source Code | Oracle Forms | Oracle Corporation |
| .FMP | Dreamingsoft | Settings Files | 123 Flash Menu Project | 123 Flash Menu | Dreamingsoft |
| .FMS | Mark Finney | Settings Files | FARSITE Initial Fuel Moistures File | FARSITE | Mark Finney |
| .FMT | Microsoft Corporation | Settings Files | FoxPro Format File | Microsoft Visual FoxPro | Microsoft Corporation |
| .FNC | E-on Software, Inc. | Settings Files | Vue Functions File | E-on Vue | E-on Software, Inc. |
| .FNP | IBM | Settings Files | IBM FileNet IDM Desktop Settings File | IBM FileNet | IBM |
| .FOL | SoftKey | Settings Files | PFS First Choice Database File | SoftKey PFS First Choice | SoftKey |
| .FORM | Oracle Corporation | Settings Files | NetBeans Java GUI Designer Form | NetBeans | Open Source |
| .FPL | Piotr Pawlowski | Settings Files | Foobar2000 Playlist File | Foobar2000 | Piotr Pawlowski |
| .FPT | Sage | Settings Files | ACT! Data File | Act! | Swiftpage, Inc. |
| .FPW | Microsoft Corporation | Settings Files | FoxPro Configuration | Microsoft Visual FoxPro | Microsoft Corporation |
| .FRAMES | Iconfactory | Settings Files | xScope Frames File | The Iconfactory xScope 4 | Iconfactory |
| .FRC | Dovetail Games | Settings Files | FS Recorder File | FS Recorder | Unknown Developer |
| .FSI | Microsoft Corporation | Settings Files | Visual F# Signature File | Microsoft Visual Studio | Microsoft Corporation |
| .FSK | Atari Corporation | Settings Files | Atari 8-bit Cassette Image | A8CAS | SourceForge |
| .FSS | Basta Computing | Settings Files | Splitty Data Split File | Basta Computing Splitty | Basta Computing |
| .FST | Image-Line | Settings Files | FL Studio State File | Image-Line FL Studio | Image-Line |
| .FTP | SolarWinds Inc. | Settings Files | FTP Configuration Data | FlashFXP | OpenSight Software, LLC. |
| .FUS | FXpansion Audio UK Ltd. | Settings Files | GURU Uninstall Script | GURU | FXpansion Audio UK Ltd. |
| .FVP | Unknown Developer | Settings Files | File Viewer Plus Batch Presets File | Unknown Software | Unknown Developer |
| .FWT | FacetCorp | Settings Files | FacetWin Configuration File | FacetWin | FacetCorp |
| .FXB | Steinberg | Settings Files | FX Bank File | Steinberg Cubase | Steinberg |
| .FXP | Microsoft Corporation | Settings Files | FoxPro Compiled Program | Microsoft Visual FoxPro | Microsoft Corporation |
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