| rsf | WAsP Resource Data |
| rsfx | Reflection Desktop Data |
| rsm | CCNA Network Visualizer Data |
| rsmap | RSTuner RSMap Data |
| rsnp | RegSnap Data |
| rsr | Poser Model Preview |
| rst | ANSYS Results Data |
| rstm | eXtendable Wad Editor RSTM Data |
| rstp | ANSYS Results Data |
| rsu | OS/2 Warp Remote Software Update |
| rsu | IBIS-TRAD RAW Data |
| 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 | BrainVoyager QX Regions-of-interest TC Data |
| rtc | CARE-S InfoWorks Real Time Control Data |
| rtd | Retina Network Security Scanner Output |
| rtda | Microsoft Enterprise Voice Route Helper Data |
| rtgs | Oracle FLEXCUBE RTGS Message |
| rth | ANSYS Results File |
| rti2 | Indexed Rainbow Tables Data |
| rtk | Adobe RoboHelp RTK Data File |
| rtm | Navicat Report File |
| rtmp | RTMP Stream Data |
| rtn | Carlson Survey Road Network File |
| rtp | GROMACS Residue Topology |
| rtr | Astrotite 200X Offline Data Repair File |
| rtree | General R-Tree Data |