| f3f | Crazy Machines Font |
| fac | Bioware Aurora Faction |
| fbi | Total Annihilation Main Unit Definition |
| fbq | Trine 2 Data |
| fbrb | Battlefield: Bad Company 2 Game Data |
| fbx | Unreal Engine 4 Scene |
| fbx | Dota 2 3D Model Data |
| fc2map | Far Cry 2 User Map |
| fcm | fCraft World |
| fcr | RollerCoaster Tycoon 3 Camera Data |
| fdu | The Suffering: Ties That Bind Data |
| feu | Far Cry 3 Data |
| ff | CoD2 Fast File |
| ffn | FIFA Game Data |
| ffna | Guild Wars Game Data |
| fila | Aleph One Film Data |
| filter | Path of Exile Filter Data |
| fjb | Furcadia FJB Settings |
| flmod | Freelancer Mod Manager Archive |
| fml | WWF RAW Character |
| fomod | Fallout 3 Mod Archive |
| forge | Assassin's Creed Game Data |
| 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 |
| fpop | Spider-Man: Shattered Dimensions Saved Game |
| frw | RollerCoaster Tycoon 3 Fireworks Data |
| fs2 | FreeSpace 2 Saved Mission |
| fs5 | Microsoft Flight Simulator Scenery Data |