| ress | Unity 3D Model Archive |
| rez | Escape Velocity Plug-in |
| rfa | Battlefield 1942 Data |
| rfd | Emperor: Battle for Dune Data |
| rfm | rFactor Modification |
| rfx | RealFlight Archive |
| rim | BioWare Resource Image |
| rkc | Mario Kart Wii Saved Game |
| rkg | Mario Kart Wii Ghost Car Data |
| rkv | Project Snowblind Game Data |
| rl | The 7th Guest Archive |
| rl2 | Descent 2 Level Data |
| rmdp | Quantum Break Game Data |
| rme | Final Fantasy Audio Data |
| rmo | Rolemaster Character Data |
| rndp | Pokemon Random Preseeds Data |
| rnqs | Pokemon Randomization Quick Settings |
| rnr | The 11th Hour Game Data |
| rof | Jedi Knight: Jedi Academy Animation File |
| rofl | League of Legends Replay File |
| rol | The 11th Hour Game Data |
| roq | ID Software Game Video |
| roq | The 11th Hour Game Data |
| ros | BattleScribe Roster Editor Data |
| rot | Homeworld 2 Graphics Data |
| rpf | Grand Theft Auto V Game Archive |
| rpgmvm | RPG Maker MV Encrypted M4A Audio |
| rpgmvo | RPG Maker MV Encrypted OGG Audio |
| rpgmvp | RPG Maker MV Encrypted PNG Image |
| rpgsave | RPG Maker Saved Game |
| rpkg | Hitman Game Package |
| rpl | Toribash Replay |
| rrs | Road Rash Save File |
| rs2 | RailSim2 Saved Layout |
| rs5 | IonFx Miasmata RS5 Data |
