| fas | QuickSilver Fast Save Lisp Data |
| fasta | FASTA Sequence |
| fastq | FASTQ Sequence |
| fat | Zinf Theme |
| fau | Creator Collapsed Fault List |
| fav | Microsoft Outlook Navigation Bar |
| fav | Technics SX-KN6000 Favorites Data |
| favorite | Apple iDVD Favorites Data |
| favoritemetadata | Transmit Favorites Data |
| favs | PlasmaEPG Saved Favorites Data |
| fax | Now Contact Fax Template |
| faz | DeskMate Generic Character Data |
| fb | DR-DOS Backup Data |
| fb! | FlashGet Unfinished File |
| fb1 | FAWAVE Data File |
| fb2 | FAWAVE Binary Data |
| fba | FinalBurn Alpha Image |
| fbat | FAR HTML Batch Compile Data |
| fbc | Family Tree Maker Compressed Backup Data |
| fbd | CADfix Geometry Database |
| fbd | DART Pro 98 User-defined Complex Restoration Filter |
| fbexplore | FileBoss Explorer Data |
| fbfilesetx | FileBoss Fileset Data |
| fbk | Family Tree Maker Backup Data |
| fbk | FlashFXP Backup Data |
| fbk | Microsoft Dynamics NAV Database Backup |
| fbl | CADfix Command Level Log |
| fbl | iGO Map file |
| fbm | CADfix ASCII Geometry Data |
| fbm | CADfix Command Level Log |
| fbm | CADfix Geometry Database |
| fbmod | Frosty Tool Suite Data |
| fbn | Sony-Ericsson Phone Flash Filesystem |
| fbnd | Mac OS X Communication Tool Data |
| fbr | Avantes Avasoft v8 Bare Fiber Data |
