| rov | Siebel Report Object Variable |
| rox | Siebel Report Object Executable |
| roz | aSc Timetables Data |
| rp2 | RetroPlatform Player Archive |
| rp9-snapshot | RetroPlatform Snapshot Image |
| rpb | Radmin Phonebook |
| rpc | Crystal Reports RPC File |
| rpc | BillQuick Enterprise Invoice Data |
| rpc3 | NI Diadem RPC3 File |
| rpd | Oracle BI EE Repository |
| rpe | Performance Analyzer Data |
| rpk | RadLight Media Player Skin |
| rpk | Rail Simulator Package |
| rpr | ArchiCAD Roof Properties |
| rpt | Crystal Reports Report |
| rpt | BI/Query Report Specification |
| rpv | RealPlayer Visualization |
| rpx | Laservault Backup Index File |
| rq | SPARQL Query |
| rqb | Sybase PowerDesigner Requirements Model Backup |
| rql | RequisitePro Database Information File |
| rqm | Sybase PowerDesigner Requirements Model |
| rra | vRigger Rigging Gear |
| rrd | WAsP Roughness Description |
| rrd | RRDtool Round Robin Database |
| rrg | JRiver Media Center License File |
| rrp | Running Time Logger Profile |
| rrp | Rhythm Rascal Project |
| rrr | Registry Mechanic Backup |
| rrt | Rhapzode Resource Template |
| rrx | IBM Datacap Defines Data |
| rs8 | ProSource Data |
| rsd | Resort Software Database |
| rsd | RuneScape Demon Data |
| rsdb | Resort Software Database |
