| .F | The Eclipse Foundation | Ontwikkelaarsbestanden | Fortran Source Code | MacroMates TextMate | MacroMates |
| .F# | Microsoft Corporation | Ontwikkelaarsbestanden | F# Source Code File | F# | Microsoft Corporation |
| .F03 | The Eclipse Foundation | Ontwikkelaarsbestanden | Fortran Source Code | MacroMates TextMate | MacroMates |
| .F40 | Digital Equipment Corporation | Ontwikkelaarsbestanden | PDP-10 FORTRAN-4 Compiler Source File | PDP-10 | Digital Equipment Corporation |
| .F77 | Intel Corporation | Ontwikkelaarsbestanden | Fortran 77 Language Source File | Intel Fortran Compiler | Intel Corporation |
| .F90 | Intel Corporation | Ontwikkelaarsbestanden | Fortran 90 Source Code File | Absoft Pro Fortran | Absoft Corporation |
| .F95 | Open Source | Ontwikkelaarsbestanden | Fortran 95 Source Code File | Absoft Pro Fortran | Absoft Corporation |
| .FACES | Oracle Corporation | Ontwikkelaarsbestanden | FacesServlet Page | JavaServer Faces | Oracle Corporation |
| .FACTOR | Factor Community | Ontwikkelaarsbestanden | Factor Language Source File | Factor | Factor Community |
| .FBP | Open Source | Ontwikkelaarsbestanden | WxFormBuilder Project | wxWidgets | Open Source |
| .FCE | EaSynth Solution | Ontwikkelaarsbestanden | ForeUI Custom Element File | EaSynth Solution ForeUI | EaSynth Solution |
| .FCL | EaSynth Solution | Ontwikkelaarsbestanden | ForeUI Custom Library File | EaSynth Solution ForeUI | EaSynth Solution |
| .FDM | Microsoft Corporation | Ontwikkelaarsbestanden | Exchange Forms Designer Form Message | Microsoft Exchange Server | Microsoft Corporation |
| .FGL | Fifth Generation Systems | Ontwikkelaarsbestanden | Fifth Generation Language Source File | Notepad++ | Don Ho |
| .FILTERS | Microsoft Corporation | Ontwikkelaarsbestanden | Visual C++ Project Filters File | Microsoft Visual Studio | Microsoft Corporation |
| .FLA | Adobe Systems Incorporated | Ontwikkelaarsbestanden | Adobe Animate Animation | Adobe Animate CC 2017 | Adobe Systems Incorporated |
| .FMB | Oracle Corporation | Ontwikkelaarsbestanden | Oracle Forms Binary Source Code | Oracle Forms | Oracle Corporation |
| .FMT | Microsoft Corporation | Ontwikkelaarsbestanden | FoxPro Format File | Microsoft Visual FoxPro | Microsoft Corporation |
| .FOOTER | Chuck Shotton | Ontwikkelaarsbestanden | WebSTAR Directory Indexer Footer | WebSTAR | Kerio Technologies |
| .FOR | MacroMates | Ontwikkelaarsbestanden | Fortran 77 Source File | MacroMates TextMate | MacroMates |
| .FP | FileMaker Inc. | Ontwikkelaarsbestanden | FileMaker Pro Spreadsheet | FileMaker Pro | FileMaker Inc. |
| .FPC | Microsoft Corporation | Ontwikkelaarsbestanden | FoxPro Catalog Memo | Microsoft Visual FoxPro | Microsoft Corporation |
| .FPM | The Game Creators | Ontwikkelaarsbestanden | FPS Creator Map File | FBS Creator | The Game Creators |
| .FPP | The Eclipse Foundation | Ontwikkelaarsbestanden | Fortran Source Code | MacroMates TextMate | MacroMates |
| .FPT | Sage | Ontwikkelaarsbestanden | ACT! Data File | Act! | Swiftpage, Inc. |
| .FRM | Oracle Corporation | Ontwikkelaarsbestanden | MySQL Database Format File | MySQL | Oracle Corporation |
| .FRX | Microsoft Corporation | Ontwikkelaarsbestanden | Visual Basic Binary Form File | Microsoft Visual Basic | Microsoft Corporation |
| .FS | Microsoft Corporation | Ontwikkelaarsbestanden | Visual F# Source File | Microsoft Visual Studio | Microsoft Corporation |
| .FSF | Microsoft Corporation | Ontwikkelaarsbestanden | Microsoft Office Cache Data | Microsoft Office | Microsoft Corporation |
| .FSI | Microsoft Corporation | Ontwikkelaarsbestanden | Visual F# Signature File | Microsoft Visual Studio | Microsoft Corporation |
| .FSL | AutoDesSys, Inc. | Ontwikkelaarsbestanden | Form•Z Script | AutoDesSys formZ | AutoDesSys, Inc. |
| .FSSCRIPT | Microsoft Corporation | Ontwikkelaarsbestanden | Visual F# Script File | Microsoft Notepad | Microsoft Corporation |
| .FSX | Microsoft Corporation | Ontwikkelaarsbestanden | Visual F# Script File | Microsoft Notepad | Microsoft Corporation |
| .FTL | Apache Software Foundation | Ontwikkelaarsbestanden | FreeMarker Template File | FreeMaker | Apache Software Foundation |
| .FTN | The Eclipse Foundation | Ontwikkelaarsbestanden | Fortran Source Code | MacroMates TextMate | MacroMates |
| .FW4 | Selections & Functions | Ontwikkelaarsbestanden | Framework IV File | Framework | Selections & Functions |
| .FXC | DIMDATA Co., Ltd | Ontwikkelaarsbestanden | FilePackager Configuration | DIMDATA FilePackager | DIMDATA Co., Ltd |
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