| 1 | F | N/A | Fortran Source Code |
| 2 | F2G | N/A | GIGABYTE BIOS update |
| 3 | F3G | N/A | GIGABYTE BIOS update |
| 4 | F4A | Adobe Systems | Adobe Flash Protected Audio Format |
| 5 | F4B | Adobe Systems Incorporated | Adobe Flash MP4 Audio EBook |
|
| 6 | F4F | Adobe Systems | Flash Video Fragment |
| 7 | F4G | N/A | GIGABYTE BIOS update |
| 8 | F4M | Adobe Systems Incorporated | Adobe HTTP Dynamic Streaming Flash Media Manifest |
| 9 | F4P | Adobe Systems | Adobe Flash Protected Media Format |
| 10 | F4V | Adobe Systems | Flash MP4 Video Format |
| 11 | F5G | N/A | GIGABYTE BIOS update |
| 12 | F6G | N/A | GIGABYTE BIOS update |
| 13 | F90 | N/A | Fortran 90 Source Code Format |
| 14 | FA | N/A | FASTA Formatted Sequence Format |
| 15 | FAC | N/A | FACE Image Format |
| 16 | FACE | N/A | FACE Graphic Format |
| 17 | FACT | EIAS3D | EIAS ElectricImage 3D |
| 18 | FACTORYPATH | The Eclipse Foundation | Eclipse Factorypath |
| 19 | FAG | N/A | Win32.AutoRun.fag |
| 20 | FAILUREREQUESTS | N/A | macOS (OS X) data |
| 21 | FAQ | N/A | Frequently Asked Questions Document |
| 22 | FASTA | N/A | FASTA Sequence Format |
| 23 | FASTQ | N/A | FASTQ format |
| 24 | FAT | The Zinf Team | Zinf Theme Format |
| 25 | FAV | Microsoft Corporation | Microsoft Outlook Bar-shortcut |
| 26 | FAVORITE | Apple, Inc. | Apple IDVD Favorite |
| 27 | FAX | Now Software | Fax Document |
| 28 | FB2 | FictionBook | FictionBook 2.0 Format |
| 29 | FBL | TranscenData | CADfix Command Level Log Format |
| 30 | FBRB | Electronic Arts | Battlefield Bad Company 2 Data Format |
| 31 | FBX | Autodesk | Autodesk FBX Interchange Format |
| 32 | FBZ | Blueberry | FlashBack Screen Recorder Movie |
| 33 | FC2 | Smith Micro | Poser Face Pose Format |
| 34 | FCD | N/A | Virtual CD Format |
| 35 | FCDT | Adobe Systems | FormsCentral Design Template |
| 36 | FCG | N/A | FastCGI Script |
| 37 | FCGI | FastCGI | FastCGI Format |
| 38 | FCPXML | Apple | Final Cut Pro XML File |
| 39 | FCZ | Smith Micro | Compressed Poser Face Pose Format |
| 40 | FDB | N/A | Database Format |
| 41 | FDF | Adobe Systems | Acrobat Forms Data Format |
| 42 | FDI | N/A | Amiga Disk Image |
| 43 | FDL | Corel Corporation | Corel Paradox Secondary Index |
| 44 | FDML | N/A | Forms Definition Markup Language |
| 45 | FDOC | Microsoft Corporation | Microsoft XPS Document Settings |
| 46 | FDRP | Apple, Inc. | Apple Mac OS Folder Alias |
| 47 | FDRTEMPLATES | AGS Technik | FDRTools Template |
| 48 | FDSEQ | Dolphin Futures Limited | XPS Document Related Data |
| 49 | FEA | N/A | AFDKO Feature Definitions File |
| 50 | FEB | Corel Corporation | Corel WordPerfect Figure Editor Button Bar |
| 51 | FEED-MS | N/A | Microsoft Rss Feed Store |
| 52 | FEEDSDB-MS | N/A | Microsoft RSS Feeds Store |
| 53 | FEQ | N/A | SuperEQ equalizer settings |
| 54 | FEV | Firelight Technologies | FMOD Audio Events Format |
| 55 | FF | Activision | Call Of Duty 4 Fast Format |
| 56 | FF0 | RISCOS Ltd. | RISC OS TIFF Bitmap Image |
| 57 | FF6 | RISCOS Ltd. | RISC OS Encapsulated PostScript |
| 58 | FF9 | RISCOS Ltd. | Acorn RISC OS Bitmap Image Sprite |
| 59 | FFA | Microsoft | Find Fast Status Format |
| 60 | FFF | Hasselblad | Hasselblad RAW Image |
| 61 | FFIL | Apple | Mac Font Suitcase |
| 62 | FFL | Microsoft | Find Fast Document List |
| 63 | FFO | Microsoft | Find Fast Document Properties Cache |
| 64 | FFP | N/A | FLAC Fingerprint |
| 65 | FFPRESET | N/A | FFmpeg Preset |
| 66 | FFT | Microsoft | Find Fast Indexer Format |
| 67 | FFU | Microsoft Corporation | Windows Phone Full Flash Update |
| 68 | FFX | Microsoft | Find Fast Indexer Index Format |
| 69 | FGB | N/A | Valve SDK Source |
| 70 | FGD | Macromedia | Macromedia Director Graphic Format |
| 71 | FH10 | Adobe Systems | FreeHand 10 Drawing Format |
| 72 | FH11 | Adobe Systems | FreeHand 11 Drawing Format |
| 73 | FH7 | Adobe Systems | FreeHand 7 Drawing Format |
| 74 | FH8 | Adobe Systems | FreeHand 8 Drawing Format |
| 75 | FH9 | Adobe Systems | FreeHand 9 Drawing Format |
| 76 | FIDO | Adobe Systems Incorporated | Kodak Cineon Image Format |
| 77 | FIF | Interwoven Systems | Fractal Image Format |
| 78 | FIG | Xfig | Xfig Drawing |
| 79 | FILE | N/A | Generic Windows Format |
| 80 | FILELOC | Apple, Inc. | Apple Mac OS X Finder Internet Location |
| 81 | FIRST | N/A | Formatted Text |
| 82 | FIT | Garmin | Flexible Image Transport System Format |
| 83 | FITS | N/A | Flexible Image Transport System Format |
| 84 | FJL | N/A | Rootkit.Win32.Agent.fjl Virus |
| 85 | FL | Adobe | Adobe Flash Project Format |
| 86 | FL3 | Adobe Systems | Flash 3D Format |
| 87 | FLA | Adobe Systems | Adobe Flash Animation |
| 88 | FLAC | Xiph Foundation | Free Lossless Audio Codec Format |
| 89 | FLAT | N/A | Flat data file |
| 90 | FLEXOLIBRARY | Apple, Inc. | Final Cut Pro Library |
| 91 | FLH | N/A | FLIC Animation Format |
| 92 | FLI | Autodesk | FLIC Animation |
| 93 | FLIC | Autodesk | Autodesk Animator Animation |
| 94 | FLIF | N/A | Free Lossless Image Format File |
| 95 | FLM | Adobe Systems Incorporated | Adobe Premiere Filmstrip |
| 96 | FLMOD | Microsoft Corporation | Freelancer Game Archive |
| 97 | FLO | iGrafx | IGrafx FlowCharter Format |
| 98 | FLP | Image-Line | Floppy Disk Image |
| 99 | FLT | Presagis | OpenFlight Scene Description Format |
| 100 | FLV | Adobe Systems | Flash Video Format |
| 101 | FMF | Data Techniques, Inc. | FaxMan Jr Fax |
| 102 | FMK | GFI Software | FaxMaker |
| 103 | FMT | Microsoft | Database Format |
| 104 | FND | Microsoft | Windows Saved Search |
| 105 | FNL | Microsoft Corporation | Microsoft Live Mesh |
| 106 | FNLF | Novation | Novation Automap License Format |
| 107 | FNR | N/A | Trojan-Dropper.Win32.Flystud.lc. |
| 108 | FNS | Apple, Inc. | Apple FontSyncScripting Font Profile |
| 109 | FNT | Microsoft | Windows Font Format |
| 110 | FO | N/A | XSL-FO Form |
| 111 | FODG | OpenOffice Project Team | OpenDocument Flat XML Drawing |
| 112 | FODP | Oracle | OpenDocument Flat XML Presentation |
| 113 | FODS | Oracle | OpenDocument Flat XML Spreadsheet |
| 114 | FODT | Oracle | OpenDocument Flat XML Document |
| 115 | FOG | N/A | Generic |
| 116 | FOL | SoftKey | PFS First Choice Database Format |
| 117 | FOMOD | N/A | Fallout Mod Archive |
| 118 | FON | Microsoft | Microsoft Windows Bitmap Font Format |
| 119 | FONT | N/A | Font Data |
| 120 | FOR | N/A | Fortran 77 Source Format |
| 121 | FORGE | Ubisoft | Ubisoft Game Data File |
| 122 | FORM | Oracle Corporation | Java Form |
| 123 | FOT | N/A | Font Resource Format |
| 124 | FOUNTAIN | N/A | Fountain Syntax |
| 125 | FOX | Microsoft Corporation | FoxBase FoxPro Executable Format |
| 126 | FP | OpenGL | Fragment Program Format |
| 127 | FPAGE | Microsoft Corporation | Microsoft XPS Document Page |
| 128 | FPB | Ternion Corporation | FLAMES Playback Recorder |
| 129 | FPBF | Apple | Mac OS X Burn Folder |
| 130 | FPC | Microsoft Corporation | FoxPro Catalog |
| 131 | FPG | The Game Creators | DIV Games Studio Multi Map Image Format |
| 132 | FPIX | N/A | FlashPix Bitmap Image |
| 133 | FPK | 2K Games | Civilization 4 Data Format |
| 134 | FPM | The Game Creators | FPS Creator Map Format |
| 135 | FPSX | Nokia | Nokia Firmware Format |
| 136 | FPT | FileMaker | FileMaker Pro Database Memo Format |
| 137 | FPW | Microsoft Corporation | FoxPro Configuration |
| 138 | FPX | Kodak | FlashPix Bitmap Image Format |
| 139 | FP_FOLDER_INFO | N/A | Microsoft SharePoint data |
| 140 | FQ | N/A | Generic |
| 141 | FR | N/A | French Language Translation |
| 142 | FRAG | Microsoft Corporation | Microsoft XPS Document Fragment |
| 143 | FRAMEWORK | Apple | Mac OS X Application Framework |
| 144 | FRDAT | N/A | ABBYY Finereader bitmap image |
| 145 | FRM | MySQL | MySQL Database Format |
| 146 | FRS | Corel | Corel WordPerfect Screen Font Resource Format |
| 147 | FRV | Microsoft Corporation | Microsoft FRx |
| 148 | FRX | Microsoft | Visual Basic Binary Form Format |
| 149 | FS | Microsoft | Visual F# Source Format |
| 150 | FSA | Applied Biosystems | FASTA DNA And Protein Sequence Alignment |
| 151 | FSB | Firelight Technologies | FMOD Sample Bank Format |
| 152 | FSEVENTSD | Apple, Inc. | MAC OS X |
| 153 | FSEVENTSD-UUID | N/A | Fseventsd |
| 154 | FSH | OpenGL | Fragment Shader Format |
| 155 | FSI | Microsoft | Visual F# Signature Format |
| 156 | FSL | Corel | Corel Paradox Compiled Form Format |
| 157 | FSPROJ | Microsoft | Visual F# Project Format |
| 158 | FSSCRIPT | Microsoft | Visual F# Script |
| 159 | FSTAB | N/A | File System Table |
| 160 | FSX | Microsoft | Visual F# Script Format |
| 161 | FT10 | Adobe Systems | FreeHand 10 Drawing Template |
| 162 | FT11 | Adobe Systems | FreeHand 11 Drawing Template |
| 163 | FT7 | Adobe Systems | FreeHand 7 Drawing Template |
| 164 | FT8 | Adobe Systems | FreeHand 8 Template |
| 165 | FT9 | Adobe Systems | FreeHand 9 Drawing Template |
| 166 | FTG | Microsoft | Full Text Group |
| 167 | FTM | N/A | Micrografx Font Format |
| 168 | FTN | N/A | Fortran Source Code Format |
| 169 | FTP | OpenSight Software | FTP Configuration |
| 170 | FTPLOC | N/A | FTP Location |
| 171 | FTS | N/A | Flexible Image Transport System Format |
| 172 | FUJ | N/A | Worm.Win32.AutoRun.fuj Virus |
| 173 | FUL | Microsoft | Microsoft Backup Format List |
| 174 | FUZ | Bethesda Softworks | Bethesda Softworks Voice File |
| 175 | FWP | Microsoft | Microsoft Expression Web Package |
| 176 | FX4 | Northport Systems Inc. | Fugawi GPS Map |
| 177 | FXA | O3 Entertainment | OC3 Entertainment FaceFX Actor Format |
| 178 | FXD | Microsoft Corporation | FoxPro FoxDoc Support |
| 179 | FXG | Adobe Systems | Flash XML Graphics Format |
| 180 | FXML | Oracle Corporation | Oracle FXML Language Source Code |
| 181 | FXP | Microsoft | Visual FoxPro Compiled Database Format |
| 182 | FXR | N/A | Oracle Font Cross-reference |
| 183 | FXS | Microsoft | WinFax Transmit Format Graphics Format |
| 184 | FXTC | Adobe Systems Incorporated | Adobe After Effects Project |
| 185 | FXY | N/A | Fortron Embroidery Format |
