| fuk | Postal 2 Map Data |
| fuz | Elder Scrolls V: Skyrim Voice 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 |
| gcs | GURPS Character Sheet Data |
| gct | Ocarina Code Manager Data |
| gcv | 3D SexVilla Game Movie |
| gda | Dragon Age Game Data |
| gdf | GURPS Data File |
| gdg | Close Combat 4: The Battle of the Bulge Data |
| gdw | Jaws Unleashed Data |
| gea | FIFA 2000 Game Data |
| gfc | Doom 3 GFC Data |
| gff | Bioware Generic File Format |
| gfpk | Scarlet Blade Game Archive |
| gfx | Warcraft II: Tides of Darkness Image |
| ggl | Animal Quest Game Data |
| ggpk | Path of Exile Game Data |
| ghb | Lego Racers Data File |
| gic | Bioware Aurora Game Instance Comments |
| git | Bioware Waypoint Instance Struct |
| gjd | The 7th Guest Media File |
| gla2 | Modern Combat 5 Game Data |
| glb | Ultimate Stunts Binary 3D Model |
