| Extension | File Type | Files scanned | Contributor |
| F01/F02/F99 | HEC-RAS Flow file | 10 | |
| F3D | MotoRacer 3 bike model | 3 | |
| FACET | Facet file | 4 | |
| FACT | ElectricImage 3D file | 4 | |
| FAR | Farandole Composer song/module | 4 | |
| FAR | The Sims Archive file | 7 | |
| FAS | AutoCAD Fast-load AutoLISP (FAS4) | 8 | ptweasel |
| FASTA | FASTA DNA sequence | 13 | |
| FAV | Outlook Shortcuts | 9 | |
| FB | Slim! compressed archive | 20 | |
| FB2 | FictionBook 2.0 eBook | 16 | |
| FBC | FamilyTree Maker compressed backup | 7 | |
| FBF | Free Backup Fix backup | 5 | |
| FBI | Total Annihilation Main Unit Definition | 14 | |
| FBK | FamilyTree Backup File | 12 | |
| FBL | iGO map | 23 | |
| FBM | Fuzzy Bitmap | 5 | |
| FBX | Autodesk - Kaydara FBX 3D format (Binary) | 5 | |
| FBX | Autodesk - Kaydara FBX 3D format (Text) | 4 | |
| FC7 | FastCAD for Windows drawing (V7) | 13 | |
| FCA | Omnis Web Client Form Cache | 18 | |
| FCD | FidoCAD drawing | 7 | |
| FCD | Virtual CD-ROM File | 3 | .Cryorb |
| FCL | FidoCAD Library | 3 | |
| FCM | FC-M Packer song/module | 2 | |
| FCM | FCE-Ultra movie capture | 2 | |
| FCM | FidoCAD Macro | 3 | |
| FCP | Final Cut project | 12 | |
| FCS | Flow Cytometry Standard format | 10 | |
| FCS | Foobar 2000 Columns UI settings | 24 | |
| FCW | FastCAD for Windows drawing (generic) | 12 | |
| FDAT | Fiasco Database: data file | 8 | Ruggero Furlanetto |
| FDB | Fiasco Database: definition file | 16 | Ruggero Furlanetto |
| FDB | Firebird database | 18 | |
| FDD | FlexiDATA Database | 5 | |
| FDD | FormDocs document | 4 | |
| FDF | Acrobat Forms Data Format | 7 | |
| FDI | FDI Floppy Disk Image | 2 | |
| FDI | Formatted Disk Image file | 2 | |
| FDM | Floppy Disk Manager disk image | 7 | |
| FDP | FMOD Designer Project | 7 | |
| FDR | Final Draft document | 14 | |
| FDS | Nintendo Famicom (NES) Disk System | 18 | |
| FDT | FormDocs template | 39 | |
| FED | FORMIK form | 26 | |
| FF | Call of Duty game data | 13 | |
| FFDATA | ABBYY eForm Filler data | 7 | |
| FFE | Microsoft DirectInput Force Feedback Effect | 98 | |
| FFF | Gravis UltraSound PnP InterWave patch | 2 | |
| FFN | FIFA game serie Font | 5 | |
| FFNA | Guild Wars gamedata | 2 | |
| FFP | FLAC Fingerprint | 14 | |
| FFR | FFR archiv format | 2 | |
| FFX | Microsoft Fast Find Index v1.x | 7 | |
| FH* | Freehand (MX) Project (generic) | 23 | Alex Paven |
| FH10 | Freehand 10(MX) Project | 20 | Alex Paven |
| FH3 | Freehand drawing (v3) | 6 | |
| FHF | Cleanersoft Free Hide Folder data | 2 | |
| FIB/FID/FIH/FIP/FIV | File Investigator data (generic) | 7 | |
| FIC | Hyper File database | 108 | |
| FIDX | Fiasco Database: index File | 4 | Ruggero Furlanetto |
| FIF | Fractal Image Format | 3 | |
| FIG | Cabri figure | 14 | |
| FIG | DeskMate Draw drawing | 26 | |
| FIG | FIG vector drawing | 6 | |
| FIL | AVG Antivirus Vault file | 12 | |
| FIL | AVG Antivirus Vault file (v7) | 4 | |
| FIL | DeskMate Filer database | 23 | |
| FIM | Paul van Keep's Icon Heaven icons package | 55 | |
| FIN | Corel saved find/search | 5 | |
| FLA | Flash Authoring / source material | 149 | .Cryorb |
| FLA/FLAC | FLAC lossless compressed audio | 45 | |
| FLAME | Fractal Flame Parameters | 39 | Kyosuke Aoki |
| FLC | FIGfont control file | 4 | |
| FLC | FIGfont control file (zipped) | 4 | |
| FLF | FIGfont | 28 | .Cryorb |
| FLF | FIGfont (zipped) | 247 | |
| FLI | Autodesk Animator | 76 | |
| FLM | Adobe FilmStrip | 12 | |
| FLM | Flasm disassembled Flash ActionScript bytecode | 7 | |
| FLO | iGrafx FlowCharter document | 3 | |
| FLP | Flash Project | 8 | |
| FLP | FruityLoops Track | 15 | Mario "JarreFan" |
| FLT | OpenFlight 3D file | 3 | |
| FLT | Qimage Filter | 18 | Rizla99 |
| FLT | Syntrillium CoolEdit Filter | 43 | |
| FLV | Flash Video | 6 | |
| FM | FrameMaker document | 25 | |
| FMB | Oracle Binary Form | 15 | |
| FMD | Cumulate Draw's editable FMD format | 6 | |
| FMP | The Fractal Mapper map | 20 | |
| FMV | Famtasia movie capture | 2 | |
| FMX | Oracle Executable Form | 13 | |
| FMZ | Form*Z Project | 19 | |
| FNC | Vue D'Esprit 4 function definition | 92 | Alex Paven |
| FNC | Vue D'Esprit function definition (generic) | 93 | Alex Paven |
| FND | Windows Explorer saved search | 3 | |
| FNT | Bannermania font | 14 | |
| FNT | Elecbyte M.U.G.E.N. font | 5 | |
| FNT | Yountel Unicode font | 6 | |
| FON | Windows System font | 137 | |
| FOS | Fallout 3 save game | 455 | fenixproductions |
| FOT | Win 3.x Installed TrueType Font | 14 | |
| FP | FinePrint saved - output file | 8 | TBeu |
| FP3 | FloorPlan Plus/3D Drawing | 2 | |
| FP5 | FileMaker Pro database | 21 | |
| FPF | IKEA Kitchen Planner Document | 18 | |
| FPK | PerFORM Communicator File Packet | 6 | |
| FPL | foobar2000 playlist | 5 | |
| FPR | Fiasco Database: print report definitions | 2 | Ruggero Furlanetto |
| FPT | Farandole Composer pattern | 2 | |
| FPT | Sybase iAnywhere memo files | 47 | Knuth Konrad |
| FPX | Kodak FlashPix bitmap | 79 | |
| FR | Finalburn Alpha movie capture | 2 | |
| FR3 | FastReport 3 report | 6 | |
| FREC | Fiasco Database: frequencies files | 16 | Ruggero Furlanetto |
| FRF/FRL/FRP | PerFORM compressed database | 4 | |
| FRG | Sound Forge project | 4 | |
| FRL | FormFlow 1.x form | 12 | |
| FRL | PerFROM Pro Form | 5 | |
| FRL/FRP/FRZ | FormFlow 2.x form | 32 | |
| FRM | FireFly SDK Designer form | 26 | |
| FRM | MySQL Database 3.23.52 Dictionary File | 89 | Roberto 'rbnet' Bolli |
| FRM | MySQL Database Dictionary (generic) | 271 | |
| FRM | MySQL Dictionary File (ISAM) | 3 | Vincent van der Tuin |
| FRM | Phoenix Visual Designer form | 19 | |
| FRM | VBDOS 1.0 Form | 42 | |
| FRM | VisualBasic From | 88 | |
| FRO | A-Robots Fighting Robot Object | 94 | |
| FRX | Microsoft Visual Basic Form | 38 | |
| FSB | FMOD Sample Bank Format | 2 | |
| FSH | Electronic Arts image | 11 | |
| FSM | Farandole Composer sample | 2 | |
| FSN | Greeting Card Factory | 9 | |
| FSP | Flash Slideshow Builder project | 7 | |
| FSPROJ | Visual Studio F# Project | 11 | Ryan Jones |
| FSS | PaperPort slide show | 2 | |
| FSY | FileSync profile | 5 | |
| FTI | File-Type Image | 22 | |
| FTM | FaceTheMusic module/song | 14 | |
| FTR | File-Type Rule | 11 | |
| FTS | Windows Help Full-Text Search index file | 26 | |
| FTW | Family Tree Maker Family Tree | 10 | |
| FTXT | Cloanto C1-Text document | 3 | |
| FTXT | IFF-Text document | 5 | |
| FUP | FairUse Wizard project | 2 | |
| FUS | Fxpansion Uninstall Script | 2 | |
| FW | Forgotten Worlds custom Music format | 5 | |
| FW | Kodak Camera Firmware | 2 | |
| FW3 | Framework III file | 5 | |
| FWK | Colton Software Fireworkz document | 1 | |
| FX | BluffTitler Effect | 71 | Ryan Jones |
| FXB | HALion Sampler patch - bank | 9 | |
| FXM | Fuxoft AY Music chip language | 26 | |
| FXO | Direct3DX9 Shader (4.09.00.1126) | 2 | voodooattack |
| FXR | WinFax Sent / Received Document | 11 | |
| FZA | Fattz Announcement | 2 | Mario "ViRtuAl FoX" Leone |
| FZIP | Foxit Reader Add-on | 7 | |
