| fstrm | Frame Streams Protocol Data |
| fsw | Random FlashBackup Flash Data |
| fsx | FormSaver Fields Data |
| fsx | Lotus 1-2-3 FSX Data |
| fsxml | FreeSWITCH XML Data |
| fsz | Fractal Zplot Data |
| ft | EdgeCAM Feature Template |
| ft | Lotus Notes Full-text Index |
| fta | OpenFTA File |
| ftbl | PIPE-FLO Fluid Data Table |
| ftch | Extensis Portfolio Image Database |
| ftes | Autodesk Inventor Stress Analysis Test Data |
| ftf | Xperia X10 Phone FTF Firmware |
| fth | FileMaker Pro Theme |
| fth | Foobar2000 Theme Data |
| ftk | Forensic Toolkit Data |
| ftm | Family Tree Maker for DOS Data |
| ftm | Fathom Data |
| ftmb | Family Tree Maker Backup Data |
| ftp | FlashFXP XML Data |
| ftploc | Mac OS X Finder FTP Location Data |
| ftpquota | Pure-FTPd Quota Data |
| ftr | CONDOR Flight Track |
| ftr | IRIX File-type Rules Data |
| ftr | NimbleGen Feature Report Data |
| fts | FastTrack Schedule Data |
| ftv | CleverPath Forest and Trees View File |
| ftw | FontTwister Saved Text Effect |
| ftx | Fielded Text Metafile |
| ftz | fastText Quantized Model |
