| rtm | LabVIEW Run-Time Menu Data |
| rtm | Navicat Report File |
| rtmp | RTMP Stream Data |
| rtn | Carlson Survey Road Network File |
| rtn | MeasureMind 3D Data |
| rtp | GROMACS Residue Topology |
| rtp | Reactis Tester Parameter Data |
| rtpi | 3rdTech 3D Scanner Data |
| rtr | Astrotite 200X Offline Data Repair File |
| rtr | NetSim Router Configuration Data |
| rtrace | RTrace Ray Tracer Scene Data |
| rtree | General R-Tree Data |
| rts | Adobe RoboHelp RTS Data File |
| rts | Royal TS v1 Document |
| rtsl | RealAudio RTSL Data |
| rtstn | Audials Station Data |
| rtsx | Royal TS v2 Document |
| rttex | Proton Texture Data |
| rtwsh | Audials Radiotracker Wishlist |
| ru | Java Russian Font Properties Data |
| ruel | Revo Uninstaller Pro Data |
| ruf | WRAP Regulated-unappropriated Flow Adjustment Data |
| rui | SPEFO Rectified Spectrum Data |
| ruj | Oracle Database Recovery-Unit Journal |
| ruk | Recorder 6 Rucksack Data |
| run | Runscanner Scan Result |
| rup | IBM Rational Unified Process Data |
| rupaf | Revo Uninstaller Pro Activation Data |
| rus | Unreal Engine Russian Language Data |
| rut | Novapoint Grid File |
