| .f | Fortran Source Format |
| .f#+a | RagTime Classic |
| .f#+d | RagTime Classic |
| .f+db | Microsoft FoxPro Database |
| .f01 | HEC-RAS Flow |
| .f02 | HEC-RAS Flow |
| .f04 | HEC-RAS Flow |
| .f05 | HEC-RAS Flow |
| .f06 | DOS Screen Text 6 Pixels Height Font |
| .f08 | DOS Screen Text 8 Pixels Height Font |
| .f09 | DOS Screen Text 9 Pixels Height Font |
| .f10 | DOS Screen Text 10 Pixels Height Font |
| .f11 | DOS Screen Text 11 Pixels Height Font |
| .f12 | DOS Screen Text 12 Pixel Height Font |
| .f13 | Dos Screen Text 13 Pixels Height Font |
| .f16 | DOS Screen Text 16 Pixels Height Font |
| .f2b | ProntoGERBER-CONNECTION Board Database |
| .f2f | Byteworx FMEA Exported Data |
| .f2r | Farandole Linear Module Format |
| .f32 | Floating Point Raw 32-bit IEEE Data |
| .f3d | Fusion 3D Design |
| .f3f | Crazy Machines Font Data Format |
| .f3r | Farandole Blocked Linear Module Format |
| .f4a | Adobe Flash MP4 Audio Stream Format |
| .f4b | Adobe Flash MP4 Audio EBook |
| .f4f | Flash Video Fragment |
| .f4m | Adobe HTTP Dynamic Streaming Flash Media Manifest |
| .f4p | Adobe Flash Protected MP4 Format |
| .f4v | Adobe Flash Mp4 Format |
| .f4x | Adobe HTTP Dynamic Streaming Index |
| .f64 | Floating Point Raw 64-bit IEEE Data |
| .f90 | Intel Fortran 90 Language Source Format |
| .f95 | Fortran 95 Language Source Code |
| .fa | FASTA DNA Data Format |
| .fac | Facemaker Face Format |
| .face | UNIX FaceSaver Bitmap Image Format |
| .facefx | FaceFX Actor Format |
| .facefx_ingame | FaceFX In-Game Actor Format |
| .fact | EIAS ElectricImage 3D |
| .factorypath | Eclipse Factorypath |
| .fad | Office Attribute Database |
| .fadein | Fade In Screenwrite Document |
| .fae | MS Office 97 Converter DLL |
| .fag | Win32.AutoRun.fag |
| .fal | Bitmap Graphics Image Header Information Q0 |
| .fam | The Sims Family |
| .familyfile | Reunion Family Format |
| .fan | Form•Z Animation Format |
| .faq | Frequently Asked Questions Format |
| .far | Farandole Composer Music Module |
| .fas | AutoCAD Fast-load Auto LISP Format |
| .fasta | FASTA Format DNA And Protein Sequence Alignment |
| .fat | Zinf Theme Format |
| .fatesavedgame | Fate Save Game |
| .fateundiscoveredrealmssavedgame | Fate Undiscovered Realms Save Game |
| .fau | Simulation Laboratory Creator Collapsed Fault List |
| .fav | Microsoft Outlook Bar-shortcut |
| .favorite | Apple IDVD Favorite |
| .favoritemetadata | Transmit For Mac Login Data Format |
| .fax | Fax File (generic Group 3 1bit Encoded Data) |
| .fb | DR-DOS Backup |
| .fb! | FlashGet Incomplete Download |
| .fb1 | FAWAVE Binary |
| .fb2 | FictionBook EBook Format |
| .fbc | Family Tree Compressed Backup Format |
| .fbd | FlowBiz Workflow Designer Procedure Document |
| .fbf | Free Backup Fix Backup Format |
| .fbg | Shape Pro Ground Surface |
| .fbi | Total Annihilation Main Unit Definition |
| .fbk | Microsoft Dynamics NAV Backup Format |
| .fbl | IGO Map Format |
| .fbm | Fuzzy Bitmap Image Format |
| .fbn | ArcView Spatial Index |
| .fbnd | Apple Communication Tool |
| .fbok | Adobe FrameMaker Book |
| .fbp | WxFormBuilder Project Format |
| .fbp7 | FinalBuilder 7 Project |
| .fbproj | FlippingBook Photo Album Project |
| .fbq | Trine 2 Game Archive |
| .fbr | BB FlashBack Recorded Video Format |
| .fbrb | Battlefield Bad Company 2 Game Format |
| .fbs | Fastbid |
| .fbt | ABBYY FineReader Document Options Format |
| .fbu | FEBE Firefox Add-in ZIP Format |
| .fbv | FinalBuilder Persistent Variables |
| .fbw | HP Backup Split Backup Format |
| .fbx | Autodesk FBX Interchange Format |
| .fbz | BB FlashBack Screen Record Format |
| .fbz6 | FinalBuilder Compressed Project |
| .fbz7 | Compressed FinalBuilder 7 Project |
| .fc13 | FutureComposer Audio |
| .fc14 | FutureComposer Audio |
| .fc2 | Poser Face Pose Format |
| .fc2map | Far Cry 2 User Map Format |
| .fca | Omnis Web Client |
| .fcb | FAAST Builder |
| .fcc | SiteMinder Forms Credential Collector Format |
| .fcd | Virtual CD Backup Image Format |
| .fcdt | Adobe FormsCentral Form Template Format |
| .fce | EDraw Max Format Format |
| .fcf | Final Draft Document Format |
| .fcg | FastCGI Script |
| .fcgi | FastCGI Script Format |
| .fchc | Fetch Cache |
| .fchk | Gaussian Checkpoint |
| .fchp | Fetch Preference |
| .fcl | FidoCAD Library Format |
| .fcm | FCraft World Format |
| .fcod | Adobe PageMaker Filter |
| .fcp | Final Cut Pro Project Format |
| .fcpa | Officer Cost Report Data |
| .fcpr | Officer Cost Report Data |
| .fcproject | Final Cut Pro X Project Format |
| .fcr | Cost Report Data |
| .fcs | First Choice Spreadsheet |
| .fcstd | FreeCAD Drawing Format |
| .fct | FolderClone Task List Format |
| .fcw | FastCAD CAD Format |
| .fcxe | FileCapsule Deluxe Encoded |
| .fcxr | FileCapsule Deluxe |
| .fcxu | FileCapsule Deluxe |
| .fcz | Poser Compressed Face Pose Format |
| .fd | DataFlex Field Offsets For Compiler |
| .fd1 | Windows Live Photo Gallery Thumbnail Database |
| .fd2 | Epson EasyPrint PictureMate Borders Format |
| .fda | Warhammer 40,000 Audio Format |
| .fdb | Database Format |
| .fdc | Autodesk AutoCAD Field Catalogue Format |
| .fdd | Parallels Virtual Machine Floppy Disk Drive Image |
| .fde | FLAMES Dataset Export |
| .fdf | Adobe Acrobat Portable Document Input Form |
| .fdi | Floppy Disk Image |
| .fdk | Fluentizer Fluent Dictionary |
| .fdl | Corel Paradox Secondary Index |
| .fdlang4 | FeedDemon Language Resource |
| .fdm | Microsoft Exchange Server Form Message Format |
| .fdml | Forms Definition Markup Language |
| .fdoc | Microsoft XPS Document Settings |
| .fdp | FMOD Designer Project Format |
| .fdpart | Fresh Download Partial Downloaded |
| .fdr | Final Draft Document Format |
| .fdrp | Apple Mac OS Folder Alias |
| .fdrtemplates | FDRTools Template |
| .fds | FME Desktop Custom Format |
| .fdseq | XPS Document Related Data |
| .fdsrch2 | FeedDemon Search Data |
| .fdt | Final Draft Script Attributes Format |
| .fdu | Natural Security |
| .fdw | FEBDOK Document |
| .fdx | Final Draft XML Document Format |
| .fdxsl4 | FeedDemon Newspaper Style |
| .fdxt | Final Draft 8 Template Format |
| .feature | Microsoft Visual Studio SharePoint Feature Format |
| .feb | Corel WordPerfect Figure Editor Button Bar |
| .fed | FORMIK Form Data |
| .feed-ms | Microsoft Rss Feed Store |
| .feedback | Expression SketchFlow Feedback Format |
| .feedsdb-ms | Microsoft RSS Feeds Store |
| .fem | FEFLOW FEM Problem |
| .fes | Fileless Occurrence Placeholder |
| .fet | Free Timetabling Software |
| .fev | FMOD Audio Settings Format |
| .fex | WebFOCUS FOCUS Web390 Procedure |
| .fext | Extensions Manager Preferences |
| .fez | FUND E-Z Backup Archive |
| .ff | Call Of Duty FastFile Format |
| .ff0 | RISC OS TIFF Bitmap Image |
| .ff2 | Hello Engines! |
| .ff6 | RISC OS Encapsulated PostScript |
| .ff9 | Acorn RISC OS Bitmap Image Sprite |
| .ffa | Find Fast Indexer Status Format |
| .ffd | FlashFiler Format |
| .ffdata | ABBYY Eform |
| .fff | Gravis Ultrasound PnP Bank Format |
| .ffil | Mac OS X Data Fork Suitcase Format |
| .ffindex | FFmpegSource2 Media Index |
| .ffl | Find Fast Indexer Document List Format |
| .ffn | FIFA World Cup Game Data Fe Art |
| .ffo | Find Fast Indexer Document Properties Cache Format |
| .ffpreset | FFmpeg Preset |
| .ffs | FME Desktop Feature Store Format |
| .ffs_batch | FreeFileSync Configuration |
| .ffs_db | FreeFileSync Database |
| .ffs_gui | FreeFileSync Configuration |
| .ffs_real | FreeFileSync Configuration |
| .fft | Find Fast Indexer Format |
| .ffu | Windows Phone Full Flash Update |
| .ffwp | FormsForWeb Packet Format |
| .ffx | Find Fast Indexer Index Format |
| .fg | FaceGen Project Format |
| .fg3 | FX Graph Interactive Graph Format |
| .fga | Folder Guard Attributes |
| .fgb | Valve SDK Source |
| .fgc | Greeting Card Factory Greeting Card |
| .fgd | Macromedia Director Graphic Format |
| .fgdb | Fontographer Mac |
| .fgf | Nav.Net NG Fusker Generator |
| .fgl | Fifth Generation Language (5GL) Source Code Format |
| .fgp | Folder Guard Passwords |
| .fgr | FRSGiftRegistry Database |
| .fgt | FreeGantt Skeleton |
| .fgz | Formula Graphics Standalone Presentation Archive |
| .fh | Symantec Backup Exec Format |
| .fh10 | Adobe FreeHand 10 Drawing Format |
| .fh11 | Adobe FreeHand 11 Drawing Format |
| .fh12 | Adobe FreeHand Drawing |
| .fh2 | Adobe FreeHand Drawing |
| .fh3 | Adobe FreeHand Drawing |
| .fh4 | Adobe FreeHand Drawing |
| .fh40 | Adobe Freehand For Mac |
| .fh5 | Adobe FreeHand Drawing |
| .fh50 | Adobe Freehand Creator Code |
| .fh6 | Adobe FreeHand Drawing |
| .fh7 | Adobe FreeHand 7 Drawing Format |
| .fh8 | Adobe FreeHand 8 Drawing Format |
| .fh9 | Adobe FreeHand 9 Drawing Format |
| .fha3 | Adobe Freehand For Mac |
| .fhc | Canute - FHC Data Format |
| .fhd | Adobe FreeHand Vector Drawing Format |
| .fhd3 | FreeHand |
| .fhf | Free Hide Folder Data Format |
| .fhm | ASIP Meister |
| .fhs | Adobe Flash Skin XML |
| .fhx | DeltaV Configuration |
| .fhz | Adobe Robohelp ZIP Compressed Skin |
| .fi | Flash Image Image |
| .fib | File Investigator |
| .fic | WINDEV Hyper File Database |
| .fid | File Investigator Database Format |
| .fido | Kodak Cineon Image Format |
| .fif | Fractal Image Format |
| .fiff | Elekta Neuromag Data |
| .fig | Xfig Drawing |
| .fil | File List |
| .fila | Aleph One Replay Format |
| .file | Generic Windows Format |
| .fileloc | Apple Mac OS X Finder Internet Location |
| .filepart | WinSCP Temporary Download |
| .file_crcs | Electronic Arts Origin Client |
| .film | Filmkey Player Media |
| .filters | Microsoft Visual Studio VCX Project Filter Format |
| .fim | Fractal Imaginator Data/Parameter |
| .fimpp | FiM++ Source Code Format |
| .fin | Corel WordPerfect Print Format Text |
| .fio | Aldus PhotoStyler Graphics Filter |
| .fir | FireOne Fireworks Show |
| .fire | FireStarter Project Format |
| .first | Formatted Text |
| .fis | Dynamite VSP Feature Interpretation Style |
| .fit | Flexible Image Transport System Format |
| .fits | Flexible Image Transport System Format |
| .fiv | File Investigator |
| .fiz | FITS Graphics |
| .fjl | Rootkit.Win32.Agent.fjl Virus |
| .fjsw | Formulator Tarsia Jigsaw |
| .fjv | IGO Primo Map Related |
| .fkc | FBackup Catalog |
| .fkd | FotoKiss Photo Set Data |
| .fkt | KmPlot Data |
| .fky | Visual FoxPro Macro Format |
| .fl | Adobe Flash Project Format |
| .fl3 | Flash 3D Format |
| .fla | Editable Adobe Flash Movie Format |
| .flac | Audio Files Encoded By Flac - Free Lossless Audio Codec |
| .flam3 | Fractal Flames Format |
| .flame | Fractal Flames Format |
| .flb | FileMaker Pro Label Format |
| .flc | AutoDesk FLIC Format |
| .fld | YSFLIGHT Field Format |
| .flexolibrary | Final Cut Pro Library |
| .flf | Microsoft Dynamics NAV License Format |
| .flg | IsoPuzzle Flag Format |
| .flh | FLIC Animation Format |
| .fli | Autodesk Animator FLIC Animation Old Format |
| .flic | Autodesk Animator Animation |
| .flipchart | ActivInspire Flipchart Format |
| .fli_ | Autodesk Animator FLIC Animation Old Format |
| .flk | Folder Lock Encrypted Format |
| .flka | Folder Lock Encrypted Portable Folder Format |
| .flkb | Folder Lock Encrypted Folder Format |
| .flkw | Folder Lock Encrypted |
| .fll | Micrografx Designer Image Fill Pattern |
| .flm | Adobe Premiere Filmstrip |
| .flmod | Freelancer Game Archive |
| .fln | Flight Plan |
| .flo | Micrografx FlowCharter Flowchart Format |
| .flow | Expression SketchFlow Data Format |
| .flp | Floppy Disk Image |
| .flr | Netscape Live3D Format |
| .fls | Adobe Flash Lite Sound Bundle Format |
| .flst | Adobe InDesign Format |
| .flt | Autodesk Animator FLIC Format |
| .flt3 | Adobe Filter |
| .flux | FluxTime Studio Clip |
| .flv | Flash Video Format |
| .flvat | Downloaded Flash Video |
| .flw | Freelance Flowchart |
| .flwa | Folder Lock Wallet Format |
| .flx | FelixCAD Drawing Format |
| .fly | Digiflyer E-mail Document |
| .flz | MediaShow Data |
| .fm | FileMaker Pro Database Format |
| .fm1 | Lotus 1-2-3 Release 2.x Spreadsheet |
| .fm2 | FCEUX Movie |
| .fm3 | Lotus 1-2-3 Release 3.x Spreadsheet Format |
| .fm5 | FileMaker 5 Database Format |
| .fmap | Family Atlas Pulbished Family Map |
| .fmb | WordPerfect For Win File Manager Button Bar |
| .fmc | NCAD |
| .fmcf | Adobe Type Manager Preferences |
| .fmd | Microsoft Access |
| .fmdb | BUILD-QUANT Object Database |
| .fme | FME Mapping Format |
| .fmelic | FME License Format |
| .fmf | FaxMan Jr Fax |
| .fmi | FME Workbench Mapping Format |
| .fmj | FaceMorpher Project |
| .fmk | FaxMaker |
| .fmk$ | FileMaker For Mac |
| .fmk4 | FileMaker For Mac |
| .fml | WWE RAW Character Format |
| .fmo | DBASE IV Compiled Format |
| .fmod | Adobe Illustrator Flattening Module Format |
| .fmp | AutoCAD Font Map |
| .fmp12 | FileMaker Pro Database Format |
| .fmp3 | FileMaker Pro For Mac Document |
| .fmplugin | FileMaker Pro Plug-in Format |
| .fmpp | FLAMES Model Prototype |
| .fmpr | FileMaker Pro Mac |
| .fmpsl | FileMaker Pro Database Snapshot Format |
| .fmr | BrainVoyager QX Project |
| .fms | Lotus Freelance Graphics |
| .fmt | Database Format Format |
| .fmtr | FileMaker Transfer |
| .fmv | Bink Tools Full Motion Video Format |
| .fmw | FME Workspace Format |
| .fmx | FileMaker Pro Plug-in Format |
| .fmxlist | FME Transformer List Format |
| .fmxt | FileMaker Pro Mac |
| .fmz | Form-Z Project Format |
| .fn3 | Harvard Graphics 3.0 Font |
| .fna | FASTA DNA And Protein Sequence Alignment |
| .fnbk | Food Network Recipe Manager Recipe Data Format |
| .fnc | Frogans Network Certificate |
| .fnd | Microsoft Windows Explorer Saved Search Format |
| .fndr | Xmap For Mac |
| .fnet | FileMaker Network |
| .fnf | Forte Notation |
| .fni | FileNet IDM Viewer |
| .fnk | FunkTracker Module |
| .fnl | Microsoft Live Mesh |
| .fnlf | Novation Automap License Format |
| .fnm | Apache Lucene Field |
| .fnn | DOS Screen Text Font |
| .fno | Atlast File Notes Organizer CSV Data |
| .fnr | Trojan-Dropper.Win32.Flystud.lc. |
| .fnrecipes | Food Network Recipe Format |
| .fns | Apple FontSyncScripting Font Profile |
| .fnsp | Apple FontSync Scripting |
| .fnt | Font Format |
| .fnta | Marathon 2 Aleph One Font Format |
| .fnx | Fenix Key |
| .fo | XSL-FO Form Format |
| .fo1 | Borland Turbo C Font |
| .fo2 | Borland Turbo C Font |
| .fob | Microsoft Dynamics NAV (Navision) Attain Object Format |
| .foc | FOCUS Database |
| .fod | EZ-Forms ULTRA |
| .fodg | OpenDocument Flat XML Drawing |
| .fodp | OpenDocument Flat XML Presentation Format |
| .fods | OpenDocument Flat XML Spreadsheet Format |
| .fodt | OpenDocument Flat XML Document Format |
| .fof | EZ-Forms Filled Out Form |
| .fog4 | Fontographer 4 |
| .fol | PFS First Choice Database Format |
| .folder | Microsoft Windows Explorer Folder |
| .folx | Folx Download Format |
| .fom | EZ-Forms Fill Out Master Form |
| .fomod | Fallout 3 Mod Format |
| .fon | Microsoft Windows Bitmap Font Format |
| .font | Font Data |
| .fop | InfoZoom Protected Data Format |
| .for | Fortran Source Format |
| .form | Java Form |
| .forth | Forth Source Code |
| .fos | Fallout 3 Saved Game Format |
| .fot | Font Resource Format |
| .fota | Firmware Over-the-Air Format |
| .foundfiles | MAC OS X |
| .fountain | Fountain Syntax |
| .fov | MORSE Field Of View |
| .fox | FoxBase FoxPro Executable Format |
| .fp | Microsoft FoxPro Configuration Format |
| .fp2 | Insaniquarium Deluxe Fish |
| .fp3 | FileMaker Pro Database Format |
| .fp4 | FileMaker Pro Database Format |
| .fp5 | FileMaker Pro Database Format |
| .fp7 | FileMaker Pro Database Format |
| .fpa | Front Panel Designer Encrypted Order Format |
| .fpage | Microsoft XPS Document Page |
| .fpb | FLAMES Playback Recorder |
| .fpbf | Mac OS X Finder Burnable Backup Archive |
| .fpc | FoxPro Catalog |
| .fpd | MicroSim PCBoard External ASCII Footprint Definition Format |
| .fpe | FPS Creator Entity Format |
| .fpenc | FileProtect Encrypted Format |
| .fpf | IKEA Home Planner Format |
| .fpfv | File Protected From Virus |
| .fpg | DIV Games Studio Multi Map Image Format |
| .fpi | FPS Creator Intelligence Script Format |
| .fpid | FPS Creator AI Wizard Data Format |
| .fpix | FlashPix Bitmap Image |
| .fpj | FARSITE Project Format |
| .fpk | Civilization IV Game Archive |
| .fpkg | Apple Mac OS X Installer Package |
| .fpl | Flitskikker Language |
| .fpm | FPS Creator Map Format |
| .fpmb | FPS Creator Map Buffer Format |
| .fpmo | FPS Creator Map Overlay Format |
| .fpop | Spider-Man: Shattered Dimensions Saved Game |
| .fpos | Photo Pos Pro Image Format |
| .fpp | FPS Creator Prefab Format |
| .fpr | Fruitypro Samples Humanize Presets Grooves |
| .fps | FPS Creator Project Format |
| .fpsl | FileMaker Pro Snapshot Link |
| .fpsx | Symbian Firmware Flash Format |
| .fpt | FileMaker Pro Database Memo Format |
| .fpw | FoxPro Configuration |
| .fpx | Kodak FlashPiX Bitmap Image |
| .fqc | FAQ Creator Format |
| .fqf | FlashFXP Queue |
| .fqy | FLAMES (FLARE) Command |
| .fr | French Language Translation |
| .fr3 | FastReport Form Format |
| .fr4 | Fractal Explorer Quaternion Spots In Internal Parametrical Format |
| .fra | Adobe Framemaker |
| .frag | Microsoft XPS Document Fragment |
| .fram | Adobe Framemaker |
| .frame | Adobe FrameMaker Interchange Format |
| .frames | The Iconfactory XScope Frame Format |
| .framework | Apple Mac OS X Application Framework Format |
| .frc | Microsoft Flight Simulator FS Recorder Recorded Format |
| .frd | Need For Speed Track Data |
| .fre | FIFA 2002 Data Legal Screen |
| .fred | FredEditor Sound |
| .freecellsave-ms | FreeCells Saved Game Format |
| .freelist | ArcGIS |
| .frelf | Abbyy FineReader Engine License |
| .freq | SAM Frequency Model |
| .freshcontact | NAVIGON MobileNavigator Navigation |
| .frf | FreeReports Template Format |
| .frg | DBASE IV Uncompiled Report Format |
| .fri | Firefox Bookmark Backup |
| .frj | FreeForm-J Project Format |
| .frk | Apple Macintosh Resource Or Data Fork |
| .frl | Formflow Electronic Form Loader |
| .frm | MySQL Database Metadata Format |
| .frm16 | Lionheart: Legacy Of The Crusader Game |
| .fro | DBASE IV Compiled Report Format |
| .frp | PerForm Or FormFlow Form |
| .frq | Bibexcel |
| .frr | Mandelbrot Explorer Fractal Region Settings Format |
| .frs | Corel WordPerfect Screen Font Resource Format |
| .frt | Visual FoxPro Additional Report Description Format |
| .frv | Microsoft FRx |
| .frw | RollerCoaster Tycoon Fireworks Source |
| .frx | Visual FoxPro Main Report Description Format |
| .fry | Fryrender Export Format |
| .frz | Snes9x Saved State Format |
| .fs | Microsoft Visual F# Source Code Format |
| .fs2 | Descent FreeSpace 2 Game Format |
| .fs5 | Microsoft Flight Simulator Scenery |
| .fs6 | Microsoft Flight Simulator Panels |
| .fsa | FASTA DNA And Protein Sequence Alignment |
| .fsb | FMOD Audio Format |
| .fsc | FruityLoops Score Format |
| .fsd | COCO AmsterCHEM Flowsheet Document |
| .fseventsd | MAC OS X |
| .fseventsd-uuid | Fseventsd |
| .fsf | Microsoft Office Cache |
| .fsg | IBM Voice Type Languages Map Format |
| .fsh | Fragment Shader Format |
| .fsi | Microsoft Visual F# Signature Format |
| .fsif | MyLabel Designer Deluxe Label Format |
| .fsk | FotoSketcher Parameter Preset |
| .fsl | Corel Paradox Compiled Form Format |
| .fsm | Farandole Composer WaveSample Music Format |
| .fsn | Greeting Card Factory Greeting Card |
| .fso | Adobe Flash Media Server File System Object |
| .fsp | Fsplit Split |
| .fsproj | Microsoft Visual Studio Visual F# Project Format |
| .fsq | CryENGINE Facial Editor Sequence Format |
| .fsr | File Substring Replacement Utility |
| .fss | Micrografx Picture Publisher 8 Register Format |
| .fssave | Flight Simulator Save Format |
| .fsscript | Microsoft Visual Studio F# Script Format |
| .fst | FL Studio Format |
| .fstab | File System Table |
| .fsx | Microsoft Visual Studio F# Script Format |
| .fsy | PhotoFantasy Image Picture |
| .fsz | Fractal Zplot Data/parameter |
| .ft | Lotus Notes Full Test Index |
| .ft10 | Adobe FreeHand 10 Template Format |
| .ft11 | Adobe FreeHand 11 Template Format |
| .ft30 | Adobe PageMaker For Mac Filter |
| .ft7 | Adobe Freehand 7 Template Format |
| .ft8 | Adobe FreeHand 8 Template Format |
| .ft9 | Adobe FreeHand 9 Template Format |
| .ftb | Family Tree Maker Genealogy |
| .ftc | FluxTime Clip Format |
| .ftch | Extensis Portfolio Image Database |
| .ftd | FFT Designer Project |
| .ftf | Sony Ericsson Xperia Android Firmware |
| .ftg | Microsoft Windows Help Format |
| .fth | FileMaker Pro Theme Format |
| .ftil | E-Hastakshar Contract Note Format |
| .ftk | Forensic Toolkit |
| .ftl | FreeMarker Template Format |
| .ftm | Micrografx Font Format |
| .ftmb | Family Tree Maker Backup |
| .ftmt | Family Tree Maker Chart Template |
| .ftmx | Finale Score Template |
| .ftn | Fortran Language Source Code Format |
| .ftp | FTP Configuration |
| .ftpl | Simfatic Forms Template |
| .ftploc | Apple Mac OS X Finder FTP Location Format |
| .ftpquota | Ftpquota Format |
| .ftr | IRIX |
| .fts | Flexible Image Transport System Format |
| .ftv | CA CleverPath Forest & Trees |
| .ftw | Family Tree Maker Format |
| .fud | FairUse Wizard Data |
| .fuj | Worm.Win32.AutoRun.fuj Virus |
| .fuk | Postal 2 Map |
| .ful | Microsoft Backup File List |
| .full | Cygwin Variable Log |
| .fun | Koolmoves |
| .fus | GURU Uninstall Script |
| .fuse_hidden | Samba |
| .fv | Fresh View Thumbnail Cache |
| .fve | Windows BitLocker Full Volume Encryption |
| .fvp | FLUENT Path Line |
| .fvu | File Validation Utility Input |
| .fw | Firmware Update Format |
| .fw2 | FrameWork Database |
| .fw3 | FrameWork III Database |
| .fw4 | Framework IV |
| .fwb | FileWrangler Data Backup |
| .fwd | Imail Server Forwarded Mail |
| .fwdn | FWriter Document |
| .fweb | Fortran WEB |
| .fwf | Bentley InRoads Survey Feature Table |
| .fwl | FileWrangler EXE Library |
| .fwp | Frontpage Web Packages |
| .fws | FileWrangler Data File For File Splitting Configuration |
| .fwt | FacetWin Configuration Format |
| .fwx | FoxWeb Script |
| .fx | DirectX D3DXEffect Object Format |
| .fx2 | Corel WordPerfect Office Template |
| .fx3 | Fugawi Map |
| .fx4 | Fugawi GPS Map |
| .fxa | OC3 FaceFX Actor Format |
| .fxb | Steinberg VST Audio Plug-in Format |
| .fxc | DIMDATA FilePackager Configuration Format |
| .fxcb | Crysis Shader Cache |
| .fxcproj | NVidia FX Composer Project Format |
| .fxd | FoxPro FoxDoc Support |
| .fxf | IBM BigFix Action Format |
| .fxg | Adobe Flash XML Graphics Format |
| .fxh | MetaTrader 4 Backup |
| .fxi | File-Ex Data |
| .fxl | FaceFX Batch Format |
| .fxm | Fuxoft AY Music Chip Language Format |
| .fxml | Oracle FXML Language Source Code |
| .fxo | WinFax Image Format |
| .fxp | Visual FoxPro Compiled Database Format |
| .fxpl | Adobe Flash Catalyst FXP Library Format |
| .fxr | Oracle Font Cross-reference |
| .fxs | WinFax Transmit Format Graphics Format |
| .fxt | Finale Plug-in Format |
| .fxtc | Adobe After Effects Project |
| .fxw | ESignal |
| .fxy | Fortron Embroidery Format |
| .fyc | ESignal |
| .fyi | FLOWCAL Desktop |
| .fz | Fritzing Project Format |
| .fza | Form-Z Autosave Format |
| .fzb | Casio FZ-1 Bank Dump |
| .fzd | AIRLINE City Data |
| .fzf | Casio FZ-1 Full Dump |
| .fzip | Foxit Reader Add-on Format |
| .fzp | Fritzing Part Format |
| .fzv | Casio FZ-1 Voice Dump Format |
| .fzy | LexisNexis Concordance Fuzzy |
| .fzz | Fritzing Data Format |
File extensions are not normally displayed to users. To change this, go to Control Panel, select Appearance and Personalization and Folder Options. Next, select the View and find the option "Hide extensions for known file types". The option should be deselected (cleared) and confirmed with OK.
