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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .F | The Eclipse Foundation | Developer Files | Fortran Source Code | ZipZag | Open Source |
| .F95 | Open Source | Developer Files | Fortran 95 Source Code File | PSPad | Open Source |
| .FAM | Electronic Arts | Game Files | The Sims Family Data Game File | OpenEmu | Open Source |
| .FAQ | The Document Foundation | 3D Image Files | Frequently Asked Questions Document | AbiWord | Open Source |
| .FAR | Electronic Arts | Game Files | The Sims Archive File | Dragon UnPACKer | Open Source |
| .FASTQ | Technelysium | Data Files | FASTQ Format | PSPad | Open Source |
| .FAT | Open Source | Settings Files | Zinf Theme File | Zinf Audio Player | Open Source |
| .FAX | Interscape | Page Layout Files | Now Contact Fax Template | IrfanView | Open Source |
| .FB2 | Open Source | eBook Files | FictionBook 2.0 File | Calibre | Open Source |
| .FBP | Open Source | Developer Files | WxFormBuilder Project | wxWidgets | Open Source |
| .FBR | Blueberry Software | Video Files | FlashBack Screen Recording | HP Mercury Screen Recorder | Open Source |
| .FCM | fcraft.net | Game Files | fCraft World File | FCEUX | Open Source |
| .FCS | Interscape | Data Files | Flow Cytometry Standard File | FCEUX | Open Source |
| .FD | Data Access Worldwide | Data Files | DataFlex Data File | Lyx | Open Source |
| .FDB | Extensis | Data Files | Portfolio Catalog | Firebird | Open Source |
| .FDI | Open Source | Disk Image Files | Floppy Disk Image Files | E-UAE | Open Source |
| .FDL | Corel Corporation | Data Files | Corel Paradox Secondary Index | FlashDevelop | Open Source |
| .FDM | Microsoft Corporation | Data Files | Exchange Forms Designer Form Message | FlashDevelop | Open Source |
| .FDS | Adobe Systems Incorporated | Data Files | JetForm FormFlow Data File | FCEUX | Open Source |
| .FEQ | Open Source | Settings Files | SuperEQ Equalizer Settings | SuperEQ | Open Source |
| .FFD | Microsoft Corporation | Data Files | SharePoint FFDDumper Log | ffDiaporama | Open Source |
| .FFP | Open Source | Text Files | FLAC Fingerprint Data | PSPad | Open Source |
| .FGT | Open Source | Data Files | FreeGant Skeleton | FreeGant Skeleton | Open Source |
| .FIG | Open Source | Vector Image Files | Xfig Drawing | Xfig | Open Source |
| .FITS | Open Source | Raster Image Files | Flexible Image Transport System File | MSB AVIS | Open Source |
| .FLAC | Xiph.Org | Audio Files | Free Lossless Audio Codec File | Eltima Elmedia Player | Open Source |
| .FLB | FileMaker Inc. | Page Layout Files | FileMaker Pro Label File | PAPYRUS | Open Source |
| .FLD | Open Source | Game Files | YSFLIGHT Field File | YSFlight | Open Source |
| .FLG | Larry Short, Mick Amadio and Puppy community | System Files | Puppy Linux Partition Flag File | IsoPuzzle | Open Source |
| .FLP | Image-Line | Audio Files | FL Studio Project File | LMMS | Open Source |
| .FLV | Adobe Systems Incorporated | Video Files | Animate Video File | Eltima Elmedia Player | Open Source |
| .FM2 | Open Source | Video Files | FCEUX Movie File | FCEUX | Open Source |
| .FML | Headlight Software | Web Files | GetRight File Mirror List | Hexplorer | Open Source |
| .FNA | University of Virginia | Data Files | FASTA DNA And Protein Sequence Alignment | PSPad | Open Source |
| .FNT | Open Source | Font Files | Windows Font File | FontForge | Open Source |
| .FORM | Oracle Corporation | Page Layout Files | NetBeans Java GUI Designer Form | NetBeans | Open Source |
| .FP | FileMaker Inc. | Spreadsheet Files | FileMaker Pro Spreadsheet | Celestia | Open Source |
| .FPC | Microsoft Corporation | Data Files | FoxPro Catalog Memo | Free Pascal | Open Source |
| .FPP | The Eclipse Foundation | Developer Files | Fortran Source Code | Emu 8086 Flow Chart Visual Programming Language | Open Source |
| .FPR | Hewlett-Packard | Data Files | Audit Workbench Project | AbiWord | Open Source |
| .FPX | Kodak | Raster Image Files | FlashPix Bitmap Image File | IrfanView | Open Source |
| .FR | Sublime HQ Pty Ltd | Text Files | French Language Translation | PSPad | Open Source |
| .FRK | Prosoft Engineering, Inc. | Uncommon Files | Macintosh Resource Or Data Fork | MacImage | Open Source |
| .FRQ | Open Source | Data Files | Bibexcel File | BibExcel | Open Source |
| .FS | Microsoft Corporation | Developer Files | Visual F# Source File | NetBSD | Open Source |
| .FSA | University of Virginia | Data Files | FASTA DNA And Protein Sequence Alignment | PSPad | Open Source |
| .FSG | Open Source | Game Files | FreeCol Saved Game File | FreeCol | Open Source |
| .FST | Image-Line | Settings Files | FL Studio State File | PLINK | Open Source |
| .FSV | Open Source | Video Files | FreeSWITCH Video Data | FreeSWITCH | Open Source |
| .FTA | Open Source | Data Files | OpenFTA File | OpenFTA | Open Source |
| .FTN | The Eclipse Foundation | Developer Files | Fortran Source Code | Flowton | Open Source |
| .FULL | Red Hat | Text Files | Cygwin Variable Log | Cygwin | Open Source |
| .FVML | Unknown Developer | Data Files | FormVista Document | formVista | Open Source |
| .FXT | Rockstar Games | Game Files | Grand Theft Auto Fake Text File | Sanny Builder | Open Source |
| .FZ | Interaction Design Lab Potsdam | CAD Files | Fritzing Project File | Fritzing | Open Source |
| .FZB | Casio Computer Co., Ltd. | Audio Files | Casio FZ-1 Bank Dump | Fritzing | Open Source |
| .FZP | Interaction Design Lab Potsdam | CAD Files | Fritzing Part File | Fritzing | Open Source |
| .FZZ | Interaction Design Lab Potsdam | Data Files | Fritzing Shareable Project File | Fritzing | Open Source |
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