| fos | Fallout 3 Saved Game |
| fp1 | Flying Pigs for Windows Data |
| fpe | FPS Creator Entity File |
| fpi | FPS Creator Intelligence Script |
| fpid | FPS Creator AI Wizard Data File |
| fpk | Civilization 4 Game Data |
| fpm | FPS Creator Map |
| fpmb | FPS Creator Map Buffer |
| fpmo | FPS Creator Map Overlay |
| frw | RollerCoaster Tycoon 3 Fireworks Data |
| fs2 | FreeSpace 2 Saved Mission |
| fs5 | Microsoft Flight Simulator Scenery Data |
| fs6 | Microsoft Flight Simulator Panels Data |
| fsg | FreeCol Saved Game |
| fsh | Furcadia FSH Data |
| fssave | Microsoft Flight Simulator Save Data |
| fst | Crazy Machines 2 Data |
| ftex | Mario Kart 8 Cafe Texture Data |
| fuk | Postal 2 Map Data |
| fuz | Elder Scrolls V: Skyrim Voice Data |
| fv2 | Metal Gear Solid V Game Data |
| fxcb | Crysis Shader Cache Data |
| fzd | AIRLINE City Data |
| g3p | Grandprix 3 Car Physics Data |
| g3x | RealFlight Content |
| g4b | Sokoban++ Level Data |
| gaf | Total Annihilation Texture |
| gam | Cyberboard Game File |
| game | Apple Chess Saved Game |
| gau | Microsoft Flight Simulator Gauge File |
| gax | Age of Empires II: The Conquerors Expansion v1.0 Saved Game |
| gaz | Age of Empires II Saved Game |
| gblorb | Glulx Blorb Game File |
| gbx | Cyberboard GameBox File |
| gca4 | GURPS Character Data |