| rbxm | ROBLOX Model Data |
| rbxs | ROBLOX Script |
| rbz | Richard Burns Rally Data |
| rc4 | Microsoft Flight Simulator Customisation Data |
| rcc | Ran Online Resource Script |
| rce | VGA Planets 4 Race Pack |
| rcrm | LSPDFR Mini Crash Report |
| rd2 | TOCA Race Driver 2 Data File |
| rdm | Ragdoll Masters Settings |
| rdt | G-Police Game Data |
| re4 | Resident Evil 4 Game Data |
| rec | Elasto Mania Replay |
| reko | RekoNet Cardset |
| rep | GTA San Andreas Game Replay |
| repl | Ultimate Stunts Replay |
| replay | Rocket League Game Replay |
| 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 |
| rkp | REKO Cardgames Deluxe Cardset 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 |
