| rsm | CCNA Network Visualizer Data |
| rsmap | RSTuner RSMap Data |
| rsnp | RegSnap Data |
| rson | Readable Serial Object Notation Data |
| rsp | NPrinting Offline Activation Response Data |
| rsr | Poser Model Preview |
| rsr | 4D Database for Mac Plug-in |
| rss | 3DCS Sensitivity Results Data |
| rssc | Claris Resolve Script |
| rst | ANSYS Results Data |
| rstm | eXtendable Wad Editor RSTM Data |
| rstp | ANSYS Results Data |
| rstyle | pCon.planner Render Style Data |
| rsu | IBIS-TRAD RAW Data |
| rsu | OS/2 Warp Remote Software Update |
| rsw | R&R ReportWorks SQL Report Writer Report |
| rsx | IBIS-TRAD RAW Data |
| rsy | FLEXIT Multishot Survey Raw Data File |
| rt1 | SAS/GIS TIGER Basic Data Record |
| rt2 | SAS/GIS TIGER Shape Coordinate Points |
| rt3 | TnxTower Model |
| rt4 | SAS/GIS TIGER Index to Alternate Feature Names |
| rt5 | SAS/GIS TIGER Feature Name List |
| rt6 | SAS/GIS TIGER Additional Address and ZIP Code |
| rta | Adobe RoboHelp RTA Data File |
| rtc | Microsoft Office Live Meeting Settings Data |
| rtc | SOBEK Real-time Control Data |
| rtc | CARE-S InfoWorks Real Time Control Data |
| rtc | Microsoft Office Live Meeting Connection Data |
| rtc | BrainVoyager QX Regions-of-interest TC Data |