| fileloc | Mac OS X Finder Internet Location Data |
| filelock | FileLock Data |
| filepart | WinSCP Temporary Data |
| fingnet | Fing Saved Network Data |
| fio | Aldus PhotoStyler Graphics Filter |
| fip | File Investigator Internal Database |
| fis | MATLAB Fuzzy Logic Toolbox FIS File |
| fish | 3D Fish Tank Fish Data |
| fits | HippoDraw FITS Data |
| fiv | File Investigator Internal Database |
| fix | ASL Fixplot Calculated Fixations |
| fjsw | Formulator Tarsia Jigsaw Puzzle |
| fkc | FBackup Catalog File |
| fkd | FotoKiss Photo Set Data |
| fkr | FKR Program Data File |
| fl | DRM Forward Lock |
| fl3 | Adobe Photoshop Flash 3D Document |
| fl7 | PCModWin MODTRAN Output Data |
| flam3 | Fractal Flames |
| flame | Fractal Flames Data |
| flb | FileMaker Pro Label Data |
| fld | WinFlash Flashcard Settings |
| fld | 3D Fassade Plus Field Data |
| flex | Flexi Data Smoothing Data |
| flexolibrary | Final Cut Pro Library Database |
| 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 |
