| fik | MATLAB File Installation Key |
| fil | Abaqus/CAE FIL Data |
| ACL for Windows Data |
| AVG Antivirus Vault Data |
| Cardbox Database |
| Corel WordPerfect Overlay Data |
| Fractal Imaginator Data |
| Symbian OS Application Logo |
| ZENworks Application Source |
| file | Spotify Cache Data |
| filebolt | Filebolt Encrypted Data |
| fileloc | Mac OS X Finder Internet Location Data |
| filelock | FileLock Data |
| filepart | WinSCP Temporary Data |
| file_crcs | Electronic Arts Origin Client CRC Data |
| fill | CorelDRAW Vector Fill Pattern Data |
| filp | eXtendable Wad Editor FILP Data |
| fim | Fest3D Waveguide Modes Data |
| Fractal Imaginator Data |
| fin | Abaqus/CAE FIN Data |
| Personal Paint Finnish Language Data |
| XtalView Basic Crystallographic Data |
| fingerprint | Chrome Temporary Fingerprint File |
| fingnet | Fing Saved Network Data |
| fins | Autodesk Inventor Stress Analysis FINS Data |
| fio | Aldus PhotoStyler Graphics Filter |
| fip | File Investigator Internal Database |
| fir | FireOne Fireworks Show Data |
| firmware | WOW! Diagnostic Firmware Data |
| fis | Dynamite VSP Feature Interpretation Style Data |
| MATLAB Fuzzy Logic Toolbox FIS File |
| fish | 3D Fish Tank Fish Data |
| fishtank | 3D Fish Tank Data |
| fit | ESO-MIDAS FIT Data |
| fitreg | netfabb Basic 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 |
| fktmplt | SigmaTech fKey Template Designer Template |
| fl | DRM Forward Lock |
| fl3 | Adobe Photoshop Flash 3D Document |
| fl7 | PCModWin MODTRAN Output Data |
| flam3 | Fractal Flames |
| flame | Fractal Flames Data |
| flatpakref | Linux Flatpak Package Description |
| flatpakrepo | Linux Flatpak Repository Data |
| flb | FileMaker Pro Label Data |
| Papyrus Format Library |
| flc | FIGlet Control Data |
| fld | 3D Fassade Plus Field Data |
| Hijaak Thumbnail Folder |
| WinFlash Flashcard Settings |
| flex | Flexi Data Smoothing Data |
| flexolibrary | Final Cut Pro Library Database |
| flexresp | SNORT FlexResp Data |
| flf | Corel Paradox Delivered Form |
| FIGlet Figletized Text Font |
| FLAMES License Data |
| Fruity Loops Studio Data |
| Microsoft Dynamics NAV License File |
| Navision Financials License Data |
| flg | HP System Recovery Flags Data |
| MicroSim PCBoard Log Data |
| Puppy Linux Partition Flag |
| flgprd | CET Designer Custom Flooring Product |
| flgptn | CET Designer Custom Flooring Pattern |
| fli | Autodesk Animator Mask Data |
| flib | Foxit Reader Library |
| flic | Autodesk Animator Mask Data |
| flinstaller | FL Studio Installer Data |
| flipchart | ActivInspire Flipchart |
| flk | AccountEdge Company Lock Data |
| Folder Lock Data |
| flka | Folder Lock FAT32 Portable Locker File |
| flkb | Folder Lock NTFS Portable Locker File |
| flkey | Fruity Loops Studio License Key |
