| flf | Microsoft Dynamics NAV License File |
| flipchart | ActivInspire Flipchart |
| flk | Folder Lock Data |
| flka | Folder Lock FAT32 Portable Locker File |
| flkb | Folder Lock NTFS Portable Locker File |
| fln | XMap Flight Plan Data |
| flo | LightCycler v3 Experiment Data |
| flow | Microsoft Expression SketchFlow Data |
| flp | Fractal Explorer Landscape Project |
| flp | ActivInspire Flipchart |
| flr | WinFlash Results File |
| fls | WinFlash Flashcard Source |
| fls | Creator Fault List File |
| flt | WinFlash Compiled Test |
| flu | WinFlash Flashcard Source (new) |
| flw | Fluke LinkWare Database |
| flwa | Folder Lock Wallet File |
| flx | MODTRAN FLX Output File |
| flz | WinFlash Compiled Flashcard |
| fm | FileMaker Pro Data |
| fm5 | FileMaker Pro Data |
| fma | PermitMD FMA Form Definition File |
| fma | FMAudit Exported Audit Data |
| fma | PTV VISSIM Matrix Data |
| fmd | FARSITE Custom Fuel Model |
| fmdb | Ensoft Formulator Object Database |
| fmelic | FME License |
| fmi | FME Include File |
| fmp | FileMaker Pro Data |
| fmp12 | FileMaker Pro 12 Database |
