| 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 |
| rts | Royal TS v1 Document |
| rts | Adobe RoboHelp RTS Data File |
| 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 |
| rui | SPEFO Rectified Spectrum Data |
| ruj | Oracle Database Recovery-Unit Journal |
| ruk | Recorder 6 Rucksack Data |
| run | Runscanner Scan Result |
| rut | Novapoint Grid File |
| rv3 | NewsBin Pro Header Storage |
| rv4 | NewsBin Pro Header Storage |
| rv7 | Reason RV7 Data |
| rvk | GnuPG Revocation Key File |
| rvm | AVEVA Plant Design Management System Model |
| rvn | RVN Data |
| rvp | CNET CatchUp Data |
| rvq | Autodesk CFD Radiation Data |
| rvw | ReviewMate Review Data |
| rvz | AVEVA Review 3D Model |
| rw3 | RapidWeaver 3 Site |
| rw5 | Carlson 2016 RAW Data |
| rwb | RefWorks Backup File |
| rwc | WAsP Regional Wind Climate |
| rwcx | Trimble SX10 Scanned Points Data |