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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .FLC | Autodesk, Inc. | Data Files | FLIC Animation | Apple QuickTime Player | Apple |
| .FLD | Open Source | Data Files | YSFLIGHT Field File | YSFlight | Open Source |
| .FLETCH | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .FLEX | Unknown Developer | Data Files | Flexi Data Smoothing File | Flexi Smoothing Data | Interscape |
| .FLF | Microsoft Corporation | Data Files | Microsoft Dynamics NAV License File | Microsoft Dynamics NAV (Navision) | Microsoft Corporation |
| .FLG | Larry Short, Mick Amadio and Puppy community | Data Files | Puppy Linux Partition Flag File | Puppy Linux | Larry Short, Mick Amadio and Puppy community |
| .FLK | Acclivity LLC | Data Files | AccountEdge Company Lock File | AccountEdge Pro | Acclivity LLC |
| .FLL | Microsoft Corporation | Data Files | FoxPro Dynamic-Link Library | Microsoft Visual FoxPro | Microsoft Corporation |
| .FLM | Image-Line | Data Files | FL Studio Mobile Song File | Image-Line FL Studio | Image-Line |
| .FLO | RFF Electronics | Data Files | RFFlow Flowchart File | RFFlow | RFF Electronics |
| .FLOW | Microsoft Corporation | Data Files | Expression SketchFlow Data File | Microsoft Expressions SketchFlow | Microsoft Corporation |
| .FLP | Image-Line | Data Files | FL Studio Project File | LMMS | Open Source |
| .FLT | Presagis | Data Files | OpenFlight Scene Description File | ESRI ArcGIS for Desktop | ESRI (Environmental Systems Research Institute) |
| .FLU | Open Window Software | Data Files | WinFlash Educator Ver 10 Unicode Source File | WinFlash Educator | Open Window Software |
| .FLX | Autodesk, Inc. | Data Files | FLIC Animation | Apple QuickTime Player | Apple |
| .FLZ | CyberLink | Data Files | MediaShow Data | MediaShow | CyberLink |
| .FMA | MDCCI | Data Files | PermitMD Forms Mgr Agent File | PermitMD Forms Mgr Agent | MDCCI |
| .FMC | Interscape | Data Files | FormConnect Form File | FormConnect | Interscape |
| .FMD | Smith Micro Software | Data Files | MotionArtist Document File | MotionArtist | Smith Micro Software |
| .FMK | GFI Software | Data Files | FaxMaker File | FAXmaker | GFI Software |
| .FML | Headlight Software | Data Files | GetRight File Mirror List | GetRight | Headlight Software |
| .FMP | Dreamingsoft | Data Files | 123 Flash Menu Project | 123 Flash Menu | Dreamingsoft |
| .FMS | Mark Finney | Data Files | FARSITE Initial Fuel Moistures File | FARSITE | Mark Finney |
| .FMT | Microsoft Corporation | Data Files | FoxPro Format File | Microsoft Visual FoxPro | Microsoft Corporation |
| .FNA | University of Virginia | Data Files | FASTA DNA And Protein Sequence Alignment | Microsoft Notepad | Microsoft Corporation |
| .FNF | Lugert Verlag GmbH & Co. | Data Files | Forte Notation File | Forte | Lugert Verlag GmbH & Co. |
| .FNM | Fiserv, Inc. | Data Files | Fannie Mae 1003 Data File | Calyx Point | Calyx Technology |
| .FNO | Folio Corporation | Data Files | Folio Infobase File | Folio Infobase | Folio Corporation |
| .FO | Syncro Soft | Data Files | XSL-FO Formatted Form | Software602 602XML Form Filler | Software602 |
| .FOB | Microsoft Corporation | Data Files | Dynamics NAV Object Container File | Microsoft Dynamics NAV (Navision) | Microsoft Corporation |
| .FOD | EZFORMS | Data Files | EZ-Forms ULTRA Data | EZ-Forms | EZFORMS |
| .FOF | EZFORMS | Data Files | EZ-Forms Filled Out Form | EZ-Forms | EZFORMS |
| .FOP | HumanIT | Data Files | InfoZoom Protected Data File | humanIT InfoZoom | HumanIT |
| .FORMATTER | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .FORUM | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .FOW | FormalSoft, Inc. | Data Files | Family Origins Database | Family Origins | FormalSoft, Inc. |
| .FOX | Dragon's Eye Productions | Data Files | Furcadia Art File | Furcadia | Dragon's Eye Productions |
| .FP | FileMaker Inc. | Data Files | FileMaker Pro Spreadsheet | FileMaker Pro | FileMaker Inc. |
| .FPA | MakeMusic, Inc. | Data Files | Finale Performance Assessment File | Finale | MakeMusic, Inc. |
| .FPC | Microsoft Corporation | Data Files | FoxPro Catalog Memo | Microsoft Visual FoxPro | Microsoft Corporation |
| .FPD | Front Panel Express | Data Files | Front Panel Designer Project | Front Panel Designer | Front Panel Express |
| .FPE | The Game Creators | Data Files | FPS Creator Entity File | FPS Creator | The Game Creators |
| .FPL | Piotr Pawlowski | Data Files | Foobar2000 Playlist File | Foobar2000 | Piotr Pawlowski |
| .FPP | The Eclipse Foundation | Data Files | Fortran Source Code | MacroMates TextMate | MacroMates |
| .FPR | Hewlett-Packard | Data Files | Audit Workbench Project | Fortify Static Code Analyzer | Hewlett-Packard |
| .FPT | Sage | Data Files | ACT! Data File | Act! | Swiftpage, Inc. |
| .FQF | OpenSight Software, LLC. | Data Files | FlashFXP Queue File | FlashFXP | OpenSight Software, LLC. |
| .FR | Sublime HQ Pty Ltd | Data Files | French Language Translation | Notepad++ | Don Ho |
| .FRA | Electronic Arts | Data Files | FIFA World Cup Game Data | FIFA World Cup | Electronic Arts |
| .FRD | Interscape | Data Files | Frequency Response Data File | SPL Tracer | Interscape |
| .FREQ | Richard Hughey - Kevin Karplus - Anders Krogh | Data Files | SAM Frequency Model | SAM (Sequence Alignment and Modeling) | Richard Hughey - Kevin Karplus - Anders Krogh |
| .FREQ. | Richard Hughey - Kevin Karplus - Anders Krogh | Data Files | SAM Frequency Model | SAM (Sequence Alignment and Modeling) | Richard Hughey - Kevin Karplus - Anders Krogh |
| .FRF | Fast Report | Data Files | FreeReport Form File | FreeReport | Fast Report |
| .FRL | Adobe Systems Incorporated | Data Files | Electronic Form Loader File | JetForm FormFlow | Adobe Systems Incorporated |
| .FRM | Oracle Corporation | Data Files | MySQL Database Format File | MySQL | Oracle Corporation |
| .FRO | dBase, LLC | Data Files | dBASE IV Compiled Report | dBase | dBase, LLC |
| .FRP | Delrina | Data Files | PerForm Or FormFlow Form File Format | PerForm | Delrina |
| .FRQ | Open Source | Data Files | Bibexcel File | BibExcel | Open Source |
| .FRS | Corel | Data Files | Corel WordPerfect Screen Font Resource File | Corel WordPerfect | Corel |
| .FSA | University of Virginia | Data Files | FASTA DNA And Protein Sequence Alignment | Microsoft Notepad | Microsoft Corporation |
| .FSC | ProFantasy Software Ltd | Data Files | Campaign Cartographer File | Campaign Cartographer 3 | ProFantasy Software Ltd |
| .FSF | Microsoft Corporation | Data Files | Microsoft Office Cache Data | Microsoft Office | Microsoft Corporation |
| .FSI | Microsoft Corporation | Data Files | Visual F# Signature File | Microsoft Visual Studio | Microsoft Corporation |
| .FSIF | Avanquest Software | Data Files | MyLabel Designer Deluxe Data File | MyLabel Designer Deluxe | Avanquest Software |
| .FSL | AutoDesSys, Inc. | Data Files | Form•Z Script | AutoDesSys formZ | AutoDesSys, Inc. |
| .FSN | Nova Development | Data Files | Greeting Card Factory Greeting Card | Nova Greeting Card Factory | Nova Development |
| .FSP | Wondershare Software Co., Ltd. | Data Files | Flash Slideshow Builder Project | Wondershare Flash Gallery Factory | Wondershare Software Co., Ltd. |
| .FSR | Gammadyne Corp | Data Files | String-O-Matic Data | String-O-Matic | Gammadyne Corp |
| .FSS | Basta Computing | Data Files | Splitty Data Split File | Basta Computing Splitty | Basta Computing |
| .FST | Image-Line | Data Files | FL Studio State File | Image-Line FL Studio | Image-Line |
| .FT | Vero Software | Data Files | Edgecam Feature Template | Planit Edgecam | Vero Software |
| .FTA | Open Source | Data Files | OpenFTA File | OpenFTA | Open Source |
| .FTB | Ancestry.com Inc. | Data Files | Family Tree Maker Genealogy Data | Software MacKiev Family Tree Maker | Ancestry.com Inc. |
| .FTD | RHDC Services Ltd | Data Files | FFT Designer Project | FFT Designer | RHDC Services Ltd |
| .FTL | Apache Software Foundation | Data Files | FreeMarker Template File | FreeMaker | Apache Software Foundation |
| .FTM | Interscape | Data Files | FamiTracker Module | FamiTracker | jsr |
| .FTR | Serafim Limited | Data Files | Future Document | Future | Serafim Limited |
| .FTV | CA Technologies | Data Files | CA CleverPath Forest & Trees Data | CleverPath Forest & Trees | CA Technologies |
| .FTW | Ancestry.com Inc. | Data Files | Family Tree Maker File | Software MacKiev Family Tree Maker | Ancestry.com Inc. |
| .FUD | Interscape | Data Files | FairUse Wizard Data File | FairUse Wizard | Interscape |
| .FUP | Interscape | Data Files | FairUse Project File | FairUse Wizard | Interscape |
| .FUZZY | Unknown Developer | Data Files | Fuzzy Logic File | Unknown Software | Unknown Developer |
| .FVF | Fluke | Data Files | FlukeView Data | FlukeView | Fluke |
| .FVML | Unknown Developer | Data Files | FormVista Document | formVista | Open Source |
| .FVU | National Securities Depository Limited | Data Files | File Validation Utility Input Data | File Validation Utility | National Securities Depository Limited |
| .FWA | Piotr Fusik | Data Files | Fun With Art Picture Image | Recoil | Piotr Fusik |
| .FWD | Ipswitch, Inc. | Data Files | IMail Server Forwarded Mail Message | Ipswitch IMail Server | Ipswitch, Inc. |
| .FWF | Unknown Developer | Data Files | Xwave FWF Data | Unknown Software | Unknown Developer |
| .FWS | CursorArts Company | Data Files | FileWrangler Data | FileWrangler | CursorArts Company |
| .FXD | Microsoft Corporation | Data Files | FoxPro FoxDoc Support Data | Microsoft Visual FoxPro | Microsoft Corporation |
| .FXF | IBM | Data Files | BigFix Action File | BigFix | BigFix |
| .FXG | Adobe Systems Incorporated | Data Files | Flash XML Graphics File | Adobe Illustrator CC | Adobe Systems Incorporated |
| .FXI | Cottonwood Software | Data Files | File-Ex Data | File-EX | Cottonwood Software |
| .FXM | pmG Worldwide | Data Files | MessiahStudio Motion File | pmG messiahStudio | pmG Worldwide |
| .FXP | Microsoft Corporation | Data Files | FoxPro Compiled Program | Microsoft Visual FoxPro | Microsoft Corporation |
| .FYI | Flow-Cal, Inc. | Data Files | FLOWCAL Desktop Data | FLOWCAL Enterprise | Flow-Cal, Inc. |
| .FZD | Efzed Pty Ltd. | Data Files | AIRLINE City Data File | AIRLINE | Efzed Pty Ltd. |
| .FZZ | Interaction Design Lab Potsdam | Data Files | Fritzing Shareable Project File | Fritzing | Open Source |
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