| .FCR | Michigan Department of Community Health | Gegevensbestanden | Cost Report Data File | Electronic Cost Report for Microsoft Excel | Michigan Department of Community Health |
| .FCS | Interscape | Gegevensbestanden | Flow Cytometry Standard File | Verity Software House V-Comp | Interscape |
| .FCT | Salty Brine | Gegevensbestanden | FolderClone Task List | Salty Brine FolderClone | Salty Brine |
| .FCW | Evolution Computing | Gegevensbestanden | FastCAD Windows Drawing | IMSI TurboCAD Deluxe | Redway3d and others |
| .FD | Data Access Worldwide | Gegevensbestanden | DataFlex Data File | DataFlex | Data Access Worldwide |
| .FDA | Relic Entertainment | Gegevensbestanden | Dawn Of War Audio File | Relic Entertainment Dawn of War | Relic Entertainment |
| .FDB | Extensis | Gegevensbestanden | Portfolio Catalog | Portfolio | Extensis |
| .FDC | Autodesk, Inc. | Gegevensbestanden | AutoCAD Field Catalog File | Autodesk AutoCAD | Autodesk, Inc. |
| .FDE | Ternion Corporation | Gegevensbestanden | FLAMES Dataset Export File | FLAMES | Ternion Corporation |
| .FDK | Interscape | Gegevensbestanden | Fluentizer Fluent Dictionary | Fluentizer | Interscape |
| .FDL | Corel Corporation | Gegevensbestanden | Corel Paradox Secondary Index | Corel WordPerfect X8 | Corel |
| .FDM | Microsoft Corporation | Gegevensbestanden | Exchange Forms Designer Form Message | Microsoft Exchange Server | Microsoft Corporation |
| .FDS | Adobe Systems Incorporated | Gegevensbestanden | JetForm FormFlow Data File | JetForm FormFlow | Adobe Systems Incorporated |
| .FDT | Final Draft | Gegevensbestanden | Final Draft 5-7 Template | Final Draft | Final Draft |
| .FDX | Final Draft | Gegevensbestanden | Final Draft Document | Final Draft | Final Draft |
| .FED | RK SOFTWARE | Gegevensbestanden | FormEdik Form Data | FormEdik | RK SOFTWARE |
| .FEED | JRiver | Gegevensbestanden | JRiver Media Center Data | JRiver Media Center | JRiver |
| .FEM | DHI | Gegevensbestanden | FEFLOW FEM Problem | FEFLOW | DHI |
| .FENDER | Apple | Gegevensbestanden | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .FEP | Microsoft Corporation | Gegevensbestanden | WEFT Embedding Project | Web Embedding Fonts Tool (WEFT) | Microsoft Corporation |
| .FES | G&A M.C. | Gegevensbestanden | Fileless Occurrence Placeholder | Topicscape | G&A M.C. |
| .FET | Volker Dirr | Gegevensbestanden | Free Timetabling Software Data | FET - Free Timetabling Software | Volker Dirr |
| .FEX | Information Builders | Gegevensbestanden | WebFOCUS FOCUS Web390 Procedure Data | WebFOCUS | Information Builders |
| .FF1 | Page Technology Marketing, Inc | Gegevensbestanden | PCLTool File | PCLTool | Page Technology Marketing, Inc |
| .FF2 | AceBIT | Gegevensbestanden | Hello Engines! | Hello Engines | Interscape |
| .FFBEAUTY | Reallusion, Inc. | Gegevensbestanden | FaceFilter File | FaceFilter | Reallusion, Inc. |
| .FFBLUSH | Reallusion, Inc. | Gegevensbestanden | FaceFilter Blush File | FaceFilter | Reallusion, Inc. |
| .FFC | Westboro Photonics | Gegevensbestanden | Westboro Photonics Flat Field Correction Data | Photometrica | Westboro Photonics |
| .FFD | Microsoft Corporation | Gegevensbestanden | SharePoint FFDDumper Log | Microsoft Notepad | Microsoft Corporation |
| .FFDATA | ABBYY | Gegevensbestanden | ABBYY Eform Document | ABBYY FineReader | ABBYY |
| .FFF | Hasselblad | Gegevensbestanden | Hasselblad RAW Image | Microsoft Windows Photos | Microsoft Corporation |
| .FFO | Microsoft Corporation | Gegevensbestanden | Find Fast Document Properties Cache | Microsoft Outlook | Microsoft Corporation |
| .FFT | Adobe Systems Incorporated | Gegevensbestanden | Adobe Audition Noise Print File | Adobe Audition | Adobe Systems Incorporated |
| .FFW | Festo | Gegevensbestanden | Festo Firmware File | FCT | Festo |
| .FFWP | Lucom GmbH | Gegevensbestanden | FormsForWeb Packet | FormsForWeb Filler | Lucom GmbH |
| .FGD | Valve | Gegevensbestanden | Forge Game Data File | Valve Source SDK | Valve |
| .FGT | Open Source | Gegevensbestanden | FreeGant Skeleton | FreeGant Skeleton | Open Source |
| .FHC | Canute LLP | Gegevensbestanden | FHC Data File | Canute FHC | Canute LLP |
| .FHQ | Simon Orde | Gegevensbestanden | Family Historian Query | Family Historian | Simon Orde |
| .FHR | Simon Orde | Gegevensbestanden | Family Historian Query | Family Historian | Simon Orde |
| .FI | Microsoft Corporation | Gegevensbestanden | Fortran Interface Data | Fortran | IBM |
| .FID | Microsoft Corporation | Gegevensbestanden | Windows Indexing Service File | Microsoft Windows | Microsoft Corporation |
| .FIG | Open Source | Gegevensbestanden | Xfig Drawing | Winfig | Andreas Schmidt |
| .FIH | Forensic Innovations | Gegevensbestanden | File Investigator Data | File Investigator | Forensic Innovations |
| .FIL | dBase, LLC | Gegevensbestanden | Files List Object File | dBase | dBase, LLC |
| .FILELOC | Apple | Gegevensbestanden | Apple Finder Internet Location Data | Apple OS X | Apple |
| .FILES | Apple | Gegevensbestanden | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .FILTER | Apple | Gegevensbestanden | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .FIM | Terry W Gintz and Jules Ruis | Gegevensbestanden | Fractal Imaginator Data Or Parameter | Fractal Imaginator | Terry W Gintz and Jules Ruis |
| .FIN | Interscape | Gegevensbestanden | Sapir Torah Text | Sapir Torah | Interscape |
| .FINAL | Apple | Gegevensbestanden | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .FIP | Forensic Innovations, Inc. | Gegevensbestanden | RobWare File Investigator | File Investigator | Forensic Innovations |
| .FIR | Canon Inc. | Gegevensbestanden | Canon Digital Camera EOS Firmware | Canon EOS Digital Cameras | Canon Inc. |
| .FIRMWARE | Würth Online World GmbH | Gegevensbestanden | WOW! Firmware File | WOW! | Würth Online World GmbH |
| .FISH | Unknown Developer | Gegevensbestanden | 3D Fish Tank File | Unknown Software | Unknown Developer |
| .FIX | Corey Zeke Womack (Torrunt) | Gegevensbestanden | Vimage Image File | Vimage | Corey Zeke Womack (Torrunt) |
| .FJG | One Identity | Gegevensbestanden | Identity Manager Process File | Identity Manager | One Identity |
| .FJL | Symantec Corporation | Gegevensbestanden | Rootkit.Win32.Agent.fjl Virus File | AVG Antivirus | AVG Technologies |
| .FJSW | Hermitech Laboratory | Gegevensbestanden | Formulator Tarsia Jigsaw Puzzle | Formulator Tarsia | Hermitech Laboratory |
| .FKD | LANSRAD | Gegevensbestanden | FotoKiss Photo Set Data File | FotoKiss | LANSRAD |
| .FKT | KDE | Gegevensbestanden | KmPlot Data File | KmPlot | KDE |
| .FLB | FileMaker Inc. | Gegevensbestanden | FileMaker Pro Label File | FileMaker Pro | FileMaker Inc. |
| .FLC | Autodesk, Inc. | Gegevensbestanden | FLIC Animation | Apple QuickTime Player | Apple |
| .FLD | Open Source | Gegevensbestanden | YSFLIGHT Field File | YSFlight | Open Source |
| .FLETCH | Apple | Gegevensbestanden | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .FLEX | Unknown Developer | Gegevensbestanden | Flexi Data Smoothing File | Flexi Smoothing Data | Interscape |
| .FLF | Microsoft Corporation | Gegevensbestanden | Microsoft Dynamics NAV License File | Microsoft Dynamics NAV (Navision) | Microsoft Corporation |
| .FLG | Larry Short, Mick Amadio and Puppy community | Gegevensbestanden | Puppy Linux Partition Flag File | Puppy Linux | Larry Short, Mick Amadio and Puppy community |
| .FLK | Acclivity LLC | Gegevensbestanden | AccountEdge Company Lock File | AccountEdge Pro | Acclivity LLC |
| .FLL | Microsoft Corporation | Gegevensbestanden | FoxPro Dynamic-Link Library | Microsoft Visual FoxPro | Microsoft Corporation |
| .FLM | Image-Line | Gegevensbestanden | FL Studio Mobile Song File | Image-Line FL Studio | Image-Line |
| .FLO | RFF Electronics | Gegevensbestanden | RFFlow Flowchart File | RFFlow | RFF Electronics |
| .FLOW | Microsoft Corporation | Gegevensbestanden | Expression SketchFlow Data File | Microsoft Expressions SketchFlow | Microsoft Corporation |
| .FLP | Image-Line | Gegevensbestanden | FL Studio Project File | LMMS | Open Source |
| .FLT | Presagis | Gegevensbestanden | OpenFlight Scene Description File | ESRI ArcGIS for Desktop | ESRI (Environmental Systems Research Institute) |
| .FLU | Open Window Software | Gegevensbestanden | WinFlash Educator Ver 10 Unicode Source File | WinFlash Educator | Open Window Software |
| .FLX | Autodesk, Inc. | Gegevensbestanden | FLIC Animation | Apple QuickTime Player | Apple |
| .FLZ | CyberLink | Gegevensbestanden | MediaShow Data | MediaShow | CyberLink |
| .FMA | MDCCI | Gegevensbestanden | PermitMD Forms Mgr Agent File | PermitMD Forms Mgr Agent | MDCCI |
| .FMC | Interscape | Gegevensbestanden | FormConnect Form File | FormConnect | Interscape |
| .FMD | Smith Micro Software | Gegevensbestanden | MotionArtist Document File | MotionArtist | Smith Micro Software |
| .FMK | GFI Software | Gegevensbestanden | FaxMaker File | FAXmaker | GFI Software |
| .FML | Headlight Software | Gegevensbestanden | GetRight File Mirror List | GetRight | Headlight Software |
| .FMP | Dreamingsoft | Gegevensbestanden | 123 Flash Menu Project | 123 Flash Menu | Dreamingsoft |
| .FMS | Mark Finney | Gegevensbestanden | FARSITE Initial Fuel Moistures File | FARSITE | Mark Finney |
| .FMT | Microsoft Corporation | Gegevensbestanden | FoxPro Format File | Microsoft Visual FoxPro | Microsoft Corporation |
| .FNA | University of Virginia | Gegevensbestanden | FASTA DNA And Protein Sequence Alignment | Microsoft Notepad | Microsoft Corporation |
| .FNF | Lugert Verlag GmbH & Co. | Gegevensbestanden | Forte Notation File | Forte | Lugert Verlag GmbH & Co. |
| .FNM | Fiserv, Inc. | Gegevensbestanden | Fannie Mae 1003 Data File | Calyx Point | Calyx Technology |
| .FNO | Folio Corporation | Gegevensbestanden | Folio Infobase File | Folio Infobase | Folio Corporation |
| .FO | Syncro Soft | Gegevensbestanden | XSL-FO Formatted Form | Software602 602XML Form Filler | Software602 |
| .FOB | Microsoft Corporation | Gegevensbestanden | Dynamics NAV Object Container File | Microsoft Dynamics NAV (Navision) | Microsoft Corporation |
| .FOD | EZFORMS | Gegevensbestanden | EZ-Forms ULTRA Data | EZ-Forms | EZFORMS |
| .FOF | EZFORMS | Gegevensbestanden | EZ-Forms Filled Out Form | EZ-Forms | EZFORMS |
| .FOP | HumanIT | Gegevensbestanden | InfoZoom Protected Data File | humanIT InfoZoom | HumanIT |
| .FORMATTER | Apple | Gegevensbestanden | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .FORUM | Apple | Gegevensbestanden | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .FOW | FormalSoft, Inc. | Gegevensbestanden | Family Origins Database | Family Origins | FormalSoft, Inc. |
| .FOX | Dragon's Eye Productions | Gegevensbestanden | Furcadia Art File | Furcadia | Dragon's Eye Productions |
| .FP | FileMaker Inc. | Gegevensbestanden | FileMaker Pro Spreadsheet | FileMaker Pro | FileMaker Inc. |
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