| rq | SPARQL Query |
| rqb | Sybase PowerDesigner Requirements Model Backup |
| rql | RequisitePro Database Information File |
| rqm | Sybase PowerDesigner Requirements Model |
| rqns | Universal Pokemon Randomizer Data |
| rqx | RiALITY Quick Exchange Data |
| rra | vRigger Rigging Gear |
| rrd | WAsP Roughness Description |
| rrd | RRDtool Round Robin Database |
| rrd4j | RRD4J Graph Data |
| rrec | PlasmaEPG Recording State Data |
| rrf | MIKE 11 HD Results Data |
| rrg | JRiver Media Center License File |
| rro | Risk Reduction Overview Data |
| rrp | Running Time Logger Profile |
| rrp | Rhythm Rascal Project |
| rrp | Vflo Precipitation Data |
| rrpp | Oracle Reports Remote Printing Utility Data |
| rrq | SDLX Registration Request Data |
| rrr | Registry Mechanic Backup |
| rrrx | Rhapzode Compiled Output |
| rrt | Rhapzode Resource Template |
| rrx | Moxy Variable Rate Securities Data |
| rrx | IBM Datacap Defines Data |
| rs8 | ProSource Data |
| rsd | Resort Software Database |
| rsd | RuneScape Demon Data |
| rsdb | Resort Software Database |
| rsdf | RapidShare Downloader Format File |
| rsdo | Reflection Desktop Customization Rules |
| rsds | Report Server Data Source |
| rse | RockSim Engine Database |
| rsed | ResEdit Data |
| rsf | WAsP Resource Data |
| rsfx | Reflection Desktop Data |