File extensions starting with the letter F...

  .F    Compressed Archive File (UNIX)
        FORTRAN Program
  .F01  Perfect Fax Document
  .F06  DOS 6 Pixel Screen Font
  .F07  DOS 7 Pixel Screen Font
  .F08  DOS 8 Pixel Screen Font
  .F09  DOS 9 pixel Screen Font
  .F10  DOS 10 Pixel Screen Font
  .F11  DOS 11 Pixel Screen Font
  .F12  DOS 12 Pixel Screen Font
  .F13  DOS 13 Pixel Screen Font
  .F14  DOS 14 Pixel Screen Font
  .F15  DOS 15 Pixel Screen Font
  .F16  DOS 16 Pixel Screen Font
  .F2R  Farandoyle Linear Module Format
  .F3R  Farandoyle Blocked Module Format
  .F32  Raw 32-bit IEEE Floating Point Values
  .F64  Raw 64-bit IEEE Floating Point Values
  .F77  FORTRAN 77 Program
  .F90  FORTRAN Program
  .F96  Frecom FAX96 Document
  .FA1  DATAIR FAS 87/132 Reporter Data File
  .FA2  DATAIR FAS 87/132 Reporter Custom text File
  .FAC  FACE Graphic
  .FAQ  Frequently Asked Questions
  .FAR  Farandoyle Tracker Music Module
  .FAS  3D Fassade Plus Basic Module
  .FAV  MS Outlook Bar Shortcuts
  .FAX  Fax File
  .FBC  FamilyTree Compressed Backup File
  .FBK  Navison Financials Backup
        FamilyTree Backup File
  .FBM  Fuzzy Bitmap
  .FBS  File Burner Skin
  .FC   Harvard Dictionary (Harvard Graphics taken over by Serif)
  .FCD  Virtual CD-ROM
        FastCAD/EasyCAD Output
        Patton & Patton Flow Charting 3 File
        IsoBuster File
  .FCM  Forward Compression Binary File Patch
  .FCT  Foxpro Catalog
        Campaign Cartographer 2 File
  .FCW  Campaign Cartographer 2 File
  .FD   FORTRAN Declarations
        Dataflex Field Compiler Offsets
  .FDB  Navison Financials Database
        Art Explosion Portfolio Catalog File
  .FDF  Adobe Acrobat Forms Document
  .FDR  Final Draft Document File
  .FDW  F3 Design and Mapping Document Form
  .FDX  Force Index
  .FEB  WordPerfect Figure Editor Button Bar
  .FEM  CADRE Finite Element Mesh File
  .FEX  Focus File
  .FF   AGFA CompuGraphics Outline Font Description
  .FFA  MS Fast Find File
  .FFF  GUS PnP Bank
        defFax Fax Document
  .FFL  MS Fast Find File
        PrintMaster Gold Image File
  .FFO  MS Fast Find File
  .FFT  DCA/FFT Final Form Text
  .FFX  MS Fast Find File
  .FGA  Folder Guard Attributes
  .FGD  Folder Guard Data
  .FGP  Folder Guard Passwords File
  .FH3  Aldus Freehand 3 Drawing
  .FH4  Aldus Freehand 4 Drawing
  .FI   FORTRAN Interface File
  .FIF  Fractal Image Format
  .FIG  REND386/AVRIL Graphic
  .FIL  dBase Files List Object
        WordPerfect Overlay
        Application Generator File Template
  .FIM  Construsyc/Instasyc File
  .FIN  WordPerfect Print Format Text
        Perfect Writer Print Formatted Text
  .FIRE  FireStarter Project File
  .FISH  3d Fish Tank Saved Fish
  .FISHES  3d Fish Tank Saved Fishes
  .FISHTANK  3d Fish Tank Saved Fishtank
  .FIT  FITS Graphic
        MS Windows NT File Index Table
  .FIX  Generic Patch File
  .FKY  Foxpro Macro
  .FLA  Macromedia Flash Movie
  .FLB  Papyrus Format Library
  .FLC  AutoDesk FLIC Animated Picture
  .FLD  Charisma Folder
        Hijaak Thumbnail Folder
        3D Fassade Plus Field Define Module File
  .FLF  Corel Paradox Form
        OS/2 Driver File
        Navison Financials License File
  .FLI  Autodesk FLIC Animation
        EmTeX Font Library
  .FLL  Foxpro Library
  .FLM  AutoCAD Film
  .FLO  MicroGrafx FlowCharter File
  .FLP  Fruityloops Saved File
  .FLR  Live3D File
  .FLS  Farrukh Imposition Purlisher Filelist Document
  .FLT  Corel Graphic Filter
        StarTrekker Music Module
        MulitGen Open Flight File
        Asymetrix Graphics Filter Support File
        Micrografx Picture Publisher Filter
        MS Graphics Filter
  .FLX  Image File
        Dataflex Ordered Binder
        DataFlex Compiled Binary File
  .FM   Adobe FrameMaker Document
        FileMaker Pro Spreadsheet
  .FM1  Lotus Spreadsheet File
  .FM3  Harvard Device Driver (Harvard Graphics taken over by Serif)
        1-2-3 Format File
  .FMB  WordPerfect File Manager Button Bar
        Oracle Binary Form Source Code
  .FMD  Open Access File
  .FMF  IBM LinkWay Font or Icon
  .FMK  PowerStation FORTRAN Make File
  .FML  GetRight File Mirror List
        Oracle Mirror List
  .FMO  dBase Ordered Format
  .FMP  FileMaker Pro Document
  .FMT  Format File
        Style Sheet  
        Oracle Text Form Format
        MS Schedule+ Print File
        MS Visual FoxPro Csreen Format File
  .FMV  Frame Vector Metafile
  .FMX  Oracle Executable Form
  .FN3  Harvard Graphics Font
  .FND  MS Explorer Saved Search
  .FNG  Font Navigator Group File
  .FNK  FunkTracker Module
  .FNO  Folio Infobase [May be mistype of .NFO]
  .FNT  Font File (Windows 3.1)
  .FO1  Borland Turbo C Font
  .FO2  Borland Turbo C Font
  .FOG  Fontographer Font
  .FOL  1st Reader Saved Message Folder
  .FON  Font File
        Procomm Plus Call Log
  .FOR  FORTRAN Source
        WindowBase Form
  .FOT  Installed TrueType Font
  .FOX  FoxBase File
  .FP   FileMaker Pro File
  .FP1  Flying Pigs for Windows Data
  .FP3  FileMaker Pro File
  .FP5  FileMaker Pro Document
  .FPC  FoxPro Catalog File
  .FPT  FileMaker Pro File
        FoxPro Memo Fields
  .FPW  FloorPlan Plus Floorplan Drawing
  .FPX  FlashPix Bitmap  [Viewer]
  .FQF  FlashFXP Queue File
  .FR3  dBase IV Renamed dBaseIII+ Form
  .FRF  FontMonger Font
  .FRG  dBase IV Uncompiled Report
  .FRL  FormFlow File
  .FRM  Form File
        FrameMaker Document
        FrameBuilder Document
        Oracle Executable Form
        Visual Basic Form
        WordPerfect Merge Form
        DataCAD Symbol Report File
  .FRO  dBase IV Compiled Report
        FormFlow File
  .FRP  PerForm Pro Plus Form
  .FRS  WordPerfect Graphics Driver
  .FRT  FoxPro Report File
  .FRX  Visual Basic Binary Form File
        FoxPro Report File
  .FRZ  FormFlow File
  .FSC  Campaign Cartographer 2 File
  .FSF  Convert It! Factor File
        fPrint Audit Tool File
  .FSL  Borland's Paradox 7 Forms
        Corel Paradox Saved Form
  .FSM  Farandoyle Sample Format
  .FSS  Iomega Backup File Selection Set
  .FST  FastStats Analyzer File
        dbFast Linkable Program
  .FSX  Lotus 1-2-3 Data
  .FT   Lotus Notes Full Text Index
  .FTB  Roots3 Index File
  .FTG  Windows Help Full-text Search Group File
  .FTM  Family File
        MicroGrafx Font
  .FTS  Windows Help Full-Text Search Index File
  .FTV  Forest & Trees File
  .FTW  Family File
  .FVF  Fluke View
  .FW   Framework Database
  .FW2  Framework II File
  .FW3  Framework III File
  .FW4  Framework IV File
  .FWB  FileWrangler Data File Backup
  .FWL  FileWrangler EXE Library
  .FWS  FileWrangler Data File for File Splitting Configuration
  .FX   FastLynx On-Line Guide
  .FXD  WinFax Sent Document (TIFF format)
        FAXit Phonebook
  .FXI  File-Ex File
  .FXO  Fax Image Document  [Open with Quick view Plus]
  .FXP  FoxPro Compiled Source
  .FXR  WinFax Received Document (TIFF format)
  .FXS  WinFax Fax Transmit Graphic
  .FZB  Casio FZ-1 Bank Dump
  .FZF  Casio FZ-1 Full Dump
  .FZV  Casio FZ-1 Voice Dump