| flxdato | OnScale Binary Results Data |
| flxext | OnScale Extrapolation Data |
| flxffl | OnScale Free Field Data |
| flxhst | OnScale Binary History Data |
| flxinp | OnScale Job Input Data |
| flxmdl | OnScale Binary Model Data |
| flxprt | OnScale Command Log Data |
| flxwrn | OnScale Warnings Data |
| fly | Quiz-Buddy Quiz Data |
| flys | Mapwing Streaming Tour |
| flz | CyberLink MediaShow Data |
| flz | WinFlash Compiled Flashcard |
| fm | FileMaker Pro Data |
| fm2 | FCEUX 2 Movie Capture |
| fm3 | FCEUX 3 Movie Capture |
| fm3 | FileMaker v3 Database |
| fm5 | FileMaker Pro Data |
| fma | FMAudit Exported Audit Data |
| fma | PermitMD FMA Form Definition File |
| fma | PTV VISSIM Matrix Data |
| fmap | Family Atlas Published Family Map |
| fmb | Corel WordPerfect File Manager Button Bar |
| fmc | FME Desktop Catalog Data |
| fmc | MotionArtist Animated Clip |
| fmd | FARSITE Custom Fuel Model |
| fmdb | Build-Quant Object Database |
| fmdb | Ensoft Formulator Object Database |
| fme | FME Desktop Mapping Data |
| fmedb | Foto-Mosaik-Edda Mosaic Database |
| fmelic | FME License |
| fmf | FME Desktop Metafile |
| fmgen | FlexiMusic Generator Data |
| fmh | Family Medical History HD Data |
| fmi | FME Include File |
| fmk | GFI FAXmaker Data |
