| rrr | Registry Mechanic Backup |
| rrr | Rhapzode Resource Repository |
| rrrx | Rhapzode Compiled Output |
| rrs4 | Remo Recover Recovery Session |
| rrse | REALrunner Lite Sound Effect Data |
| rrt | Rhapzode Resource Template |
| rruff | RRUFF Database |
| rrw | Goldmine Report Writer Data |
| rrw | R&R Report Writer XBase Report Document |
| rrx | IBM Datacap Defines Data |
| rrx | Moxy Variable Rate Securities Data |
| rs | dnaLIMS Reaction Sheet Data |
| rs | Erosion 3D Event Data |
| rs7 | LightTools Radiant Source Model Data |
| rs8 | ProSource Data |
| rsakey | Top Secret Crypto Gold RSA Key Data |
| rsb | ReliaSoft BlockSim Data |
| rscn | Caligari TrueSpace Exported Scene |
| rscollection | RetroShare Collection Data |
| rsc_tmp | AusLogics BoostSpeed Temporary Rescue Data |
| rsd | Altair FEKO Cable Harness Geometry Data |
| rsd | CoffeeCup HTML Editor Theme Data |
| rsd | eXtendable Wad Editor RSD Data |
| rsd | RadioSure Stations Data |
| rsd | Resort Software Database |
| rsd | RuneScape Demon Data |
| rsd | Xojo RealSQLDatabase Database |
| rsd-journal | Xojo RealSQLDatabase Journal Data |
| rsdb | Resort Software Database |
| rsdf | RapidShare Downloader Format File |
