| .FPA | MakeMusic, Inc. | Datatiedostot | Finale Performance Assessment File | Finale | MakeMusic, Inc. |
| .FPC | Microsoft Corporation | Datatiedostot | FoxPro Catalog Memo | Microsoft Visual FoxPro | Microsoft Corporation |
| .FPD | Front Panel Express | Datatiedostot | Front Panel Designer Project | Front Panel Designer | Front Panel Express |
| .FPE | The Game Creators | Datatiedostot | FPS Creator Entity File | FPS Creator | The Game Creators |
| .FPL | Piotr Pawlowski | Datatiedostot | Foobar2000 Playlist File | Foobar2000 | Piotr Pawlowski |
| .FPP | The Eclipse Foundation | Datatiedostot | Fortran Source Code | MacroMates TextMate | MacroMates |
| .FPR | Hewlett-Packard | Datatiedostot | Audit Workbench Project | Fortify Static Code Analyzer | Hewlett-Packard |
| .FPT | Sage | Datatiedostot | ACT! Data File | Act! | Swiftpage, Inc. |
| .FQF | OpenSight Software, LLC. | Datatiedostot | FlashFXP Queue File | FlashFXP | OpenSight Software, LLC. |
| .FR | Sublime HQ Pty Ltd | Datatiedostot | French Language Translation | Notepad++ | Don Ho |
| .FRA | Electronic Arts | Datatiedostot | FIFA World Cup Game Data | FIFA World Cup | Electronic Arts |
| .FRD | Interscape | Datatiedostot | Frequency Response Data File | SPL Tracer | Interscape |
| .FREQ | Richard Hughey - Kevin Karplus - Anders Krogh | Datatiedostot | SAM Frequency Model | SAM (Sequence Alignment and Modeling) | Richard Hughey - Kevin Karplus - Anders Krogh |
| .FREQ. | Richard Hughey - Kevin Karplus - Anders Krogh | Datatiedostot | SAM Frequency Model | SAM (Sequence Alignment and Modeling) | Richard Hughey - Kevin Karplus - Anders Krogh |
| .FRF | Fast Report | Datatiedostot | FreeReport Form File | FreeReport | Fast Report |
| .FRL | Adobe Systems Incorporated | Datatiedostot | Electronic Form Loader File | JetForm FormFlow | Adobe Systems Incorporated |
| .FRM | Oracle Corporation | Datatiedostot | MySQL Database Format File | MySQL | Oracle Corporation |
| .FRO | dBase, LLC | Datatiedostot | dBASE IV Compiled Report | dBase | dBase, LLC |
| .FRP | Delrina | Datatiedostot | PerForm Or FormFlow Form File Format | PerForm | Delrina |
| .FRQ | Open Source | Datatiedostot | Bibexcel File | BibExcel | Open Source |
| .FRS | Corel | Datatiedostot | Corel WordPerfect Screen Font Resource File | Corel WordPerfect | Corel |
| .FSA | University of Virginia | Datatiedostot | FASTA DNA And Protein Sequence Alignment | Microsoft Notepad | Microsoft Corporation |
| .FSC | ProFantasy Software Ltd | Datatiedostot | Campaign Cartographer File | Campaign Cartographer 3 | ProFantasy Software Ltd |
| .FSF | Microsoft Corporation | Datatiedostot | Microsoft Office Cache Data | Microsoft Office | Microsoft Corporation |
| .FSI | Microsoft Corporation | Datatiedostot | Visual F# Signature File | Microsoft Visual Studio | Microsoft Corporation |
| .FSIF | Avanquest Software | Datatiedostot | MyLabel Designer Deluxe Data File | MyLabel Designer Deluxe | Avanquest Software |
| .FSL | AutoDesSys, Inc. | Datatiedostot | Form•Z Script | AutoDesSys formZ | AutoDesSys, Inc. |
| .FSN | Nova Development | Datatiedostot | Greeting Card Factory Greeting Card | Nova Greeting Card Factory | Nova Development |
| .FSP | Wondershare Software Co., Ltd. | Datatiedostot | Flash Slideshow Builder Project | Wondershare Flash Gallery Factory | Wondershare Software Co., Ltd. |
| .FSR | Gammadyne Corp | Datatiedostot | String-O-Matic Data | String-O-Matic | Gammadyne Corp |
| .FSS | Basta Computing | Datatiedostot | Splitty Data Split File | Basta Computing Splitty | Basta Computing |
| .FST | Image-Line | Datatiedostot | FL Studio State File | Image-Line FL Studio | Image-Line |
| .FT | Vero Software | Datatiedostot | Edgecam Feature Template | Planit Edgecam | Vero Software |
| .FTA | Open Source | Datatiedostot | OpenFTA File | OpenFTA | Open Source |
| .FTB | Ancestry.com Inc. | Datatiedostot | Family Tree Maker Genealogy Data | Software MacKiev Family Tree Maker | Ancestry.com Inc. |
| .FTD | RHDC Services Ltd | Datatiedostot | FFT Designer Project | FFT Designer | RHDC Services Ltd |
| .FTL | Apache Software Foundation | Datatiedostot | FreeMarker Template File | FreeMaker | Apache Software Foundation |
| .FTM | Interscape | Datatiedostot | FamiTracker Module | FamiTracker | jsr |
| .FTR | Serafim Limited | Datatiedostot | Future Document | Future | Serafim Limited |
| .FTV | CA Technologies | Datatiedostot | CA CleverPath Forest & Trees Data | CleverPath Forest & Trees | CA Technologies |
| .FTW | Ancestry.com Inc. | Datatiedostot | Family Tree Maker File | Software MacKiev Family Tree Maker | Ancestry.com Inc. |
| .FUD | Interscape | Datatiedostot | FairUse Wizard Data File | FairUse Wizard | Interscape |
| .FUP | Interscape | Datatiedostot | FairUse Project File | FairUse Wizard | Interscape |
| .FUZZY | Unknown Developer | Datatiedostot | Fuzzy Logic File | Unknown Software | Unknown Developer |
| .FVF | Fluke | Datatiedostot | FlukeView Data | FlukeView | Fluke |
| .FVML | Unknown Developer | Datatiedostot | FormVista Document | formVista | Open Source |
| .FVU | National Securities Depository Limited | Datatiedostot | File Validation Utility Input Data | File Validation Utility | National Securities Depository Limited |
| .FWA | Piotr Fusik | Datatiedostot | Fun With Art Picture Image | Recoil | Piotr Fusik |
| .FWD | Ipswitch, Inc. | Datatiedostot | IMail Server Forwarded Mail Message | Ipswitch IMail Server | Ipswitch, Inc. |
| .FWF | Unknown Developer | Datatiedostot | Xwave FWF Data | Unknown Software | Unknown Developer |
| .FWS | CursorArts Company | Datatiedostot | FileWrangler Data | FileWrangler | CursorArts Company |
| .FXD | Microsoft Corporation | Datatiedostot | FoxPro FoxDoc Support Data | Microsoft Visual FoxPro | Microsoft Corporation |
| .FXF | IBM | Datatiedostot | BigFix Action File | BigFix | BigFix |
| .FXG | Adobe Systems Incorporated | Datatiedostot | Flash XML Graphics File | Adobe Illustrator CC | Adobe Systems Incorporated |
| .FXI | Cottonwood Software | Datatiedostot | File-Ex Data | File-EX | Cottonwood Software |
| .FXM | pmG Worldwide | Datatiedostot | MessiahStudio Motion File | pmG messiahStudio | pmG Worldwide |
| .FXP | Microsoft Corporation | Datatiedostot | FoxPro Compiled Program | Microsoft Visual FoxPro | Microsoft Corporation |
| .FYI | Flow-Cal, Inc. | Datatiedostot | FLOWCAL Desktop Data | FLOWCAL Enterprise | Flow-Cal, Inc. |
| .FZD | Efzed Pty Ltd. | Datatiedostot | AIRLINE City Data File | AIRLINE | Efzed Pty Ltd. |
| .FZZ | Interaction Design Lab Potsdam | Datatiedostot | Fritzing Shareable Project File | Fritzing | Open Source |
| .G1L | Casio Computer Co., Ltd. | Datatiedostot | Casio Model 9860 Data | Unknown Software | Unknown Developer |
| .G32 | Microsoft Corporation | Datatiedostot | Microsoft FRx General Ledger Index File | Microsoft Dynamics AX | Microsoft Corporation |
| .G9 | Arktec | Datatiedostot | Gest Data File | Arktec Gest | Arktec |
| .G94 | Gaussian, Inc. | Datatiedostot | Gaussian 94 Output Chemical Modeller Input File | Gaussian | Gaussian, Inc. |
| .GAB | Open Source | Datatiedostot | Dencom Global Address Book Export File | Dencom Global Address Book | Open Source |
| .GAI | Adobe Systems Incorporated | Datatiedostot | Adobe SING Glyphlet Manager File | Adobe Creative Suite | Adobe Systems Incorporated |
| .GAL | Molecular Devices | Datatiedostot | GenePix Array List | Microsoft Excel | Microsoft Corporation |
| .GAT | Microsoft Corporation | Datatiedostot | Genetic Algorithm Timetabler | Windows sidebar gadget | Microsoft Corporation |
| .GBD | Great Budget Software | Datatiedostot | Great Budget Budget Definition Data | Microsoft Project 2016 | Microsoft Corporation |
| .GBF | Yuku | Datatiedostot | General Bible Format | Quick Bible | Yuku |
| .GBK | National Center for Biotechnology Information | Datatiedostot | GenBank Data | Genome Compiler | Genome Compiler Corporation |
| .GBL | Ucamco | Datatiedostot | Gerber Bottom Layer Data File | CadSoft EAGLE | Autodesk, Inc. |
| .GBR | Gerber Technology | Datatiedostot | Gerber Format File | Altium Designer | Altium |
| .GBX | Nadeo | Datatiedostot | Nadeo Game File | TrackMania | Nadeo |
| .GC | Arizona | Datatiedostot | GraphClick File | GraphClick | Arizona |
| .GCC | GNU Operating System | Datatiedostot | GNU C++ File | GNU Bash | GNU Operating System |
| .GCF | Valve | Datatiedostot | Game Cache File | Steam | Valve |
| .GCT | Interscape | Datatiedostot | Ocarina Cheat Code Manager Exported Cheat | Ocarina Cheat Code Manager | Interscape |
| .GCX | Golden Software LLC | Datatiedostot | Grapher Graph File | Golden Software Grapher | Golden Software LLC |
| .GD3 | GreatProgs | Datatiedostot | GreatFamily Tree File | GreatFamily | GreatProgs |
| .GDA | The Open Group | Datatiedostot | Unix Manual Page Guide | Unix | AT&T Labs |
| .GDB | Garmin | Datatiedostot | GPS Database File | Garmin BaseCamp | Garmin |
| .GDBTABLE | Open Source | Datatiedostot | Geodatabase Table File | ESRI ArcGIS for Desktop | ESRI (Environmental Systems Research Institute) |
| .GDC | Iconics, Inc. | Datatiedostot | Iconics GraphWorx32 Document | GraphWorX32 | Iconics, Inc. |
| .GDF | Eytan Adar | Datatiedostot | GUESS Graph Data Format File | GUESS | Eytan Adar |
| .GDP | Open Source | Datatiedostot | Scrolling Game Development Kit Project | The Scrolling Game Development Kit | Open Source |
| .GDR | Nokia | Datatiedostot | Symbian OS Font File | Symbian OS | Nokia |
| .GDS | Cadence Design Systems | Datatiedostot | Graphic Data System File | Juspertor LayoutEditor | Juspertor |
| .GDT | Open Source | Datatiedostot | Gretl Data File | gretl | Open Source |
| .GDV | SmartWare Corporation | Datatiedostot | SmartWare Graphics Screen Driver | SmartWare | SmartWare Corporation |
| .GEB | Peter Gebhard | Datatiedostot | Dr. Hardware File | Dr. Hardware | Peter Gebhard |
| .GED | Thoughtful Creations | Datatiedostot | GEDCOM Genealogy Data File | Ages! | Jörn Daub e.K. |
| .GEDCOM | Open Source | Datatiedostot | GEDCOM Genealogy File | Ancestral Author | Ancestral Softworks |
| .GEF | Open Source | Datatiedostot | Geotechnical Exchange Format File | GEF plot | Open Source |
| .GEN | Sega | Datatiedostot | Sega Genesis ROM | Kega Fusion | Steve Snake |
| .GENBANK | National Center for Biotechnology Information | Datatiedostot | GenBank Data | Genome Compiler | Genome Compiler Corporation |
| .GEO | Redway3d and others | Datatiedostot | VRML Geography File | TurboCAD | IMSI/Design, LLC |
| .GEV | Frogdance Software | Datatiedostot | GelEval Document | GelEval | Frogdance Software |
| .GFC | Patton & Patton Software | Datatiedostot | Patton&Patton Flow Charting 4 Flowchart Drawing | Flow Charting | Patton & Patton Software |
| .GFF | Roche Sequencing Solutions, Inc. | Datatiedostot | SignalMap Gene-Finding Format Data File | SignalMap | Roche Sequencing Solutions, Inc. |
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