| 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 |
| ftml | Mighty Games World 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 |
| fuc | Frequently Used Commands |
| fud | FairUse Wizard Data File |
| ful | Microsoft Backup File List |
| fun | Cubify Invention Data |
| fun_list | Free Uninstaller Data |
| furl | Fact200 URL Data |
| fus | FXpansion Uninstall Script |
| fuse | Adobe Fuse 3D Model |
| fuse_hidden | Samba Temporary Data |
| fusuc | Final Uninstaller Special Uninstallation Data |
| futr | NetIQ Identity Manager Future-dated Infotype Cache |
| fv | Fresh View Thumbnail Cache |
| fvanim | Powerbullet Presenter Animation |
| fvb | TAC Vista Database Backup |
| fvd | DatABEL Filevector Data |
