| rmd | R Markdown Source Code |
| rmi | Java RMI Data |
| rmk | Clipper RMake File |
| rms | JCP Mobile Information Device Profile |
| Retek Merchandising System Settings |
| rmuf | Alpha Five Runtime Users Data |
| rnc | RELAX NG Compact Syntax |
| rng | RELAX NG Syntax File |
| rnw | Sweave Document |
| robo | RoboMind Source Code |
| RoboRealm Robo Script |
| rodl | RemObjects Definition Language |
| role | Microsoft Visual Studio Role Data |
| ron | Ron Document |
| rotest | RemObjects SDK Test Data |
| rotestresult | RemObjects SDK Test Results Data |
| rpa | WinDev HyperFileSQL Replication Journal Data |
| rpd | RapidPLUS Application File |
| rpf | ProWorx NXT Cross-reference Pointer |
| rpl | WinDev HyperFileSQL Replication Log Data |
| rplib | Axure RP Widget Library |
| rpm | WinDev HyperFileSQL Replication Master Data |
| rpo | GCC Compiler Template Object |
| rpp | FactoryTalk View Studio RecipePlus Component File |
| RPP Script |
| SymbianOS Pre-processed Resource |
| WinDev HyperFileSQL Replication Parameters Data |
| rpt | Uniface Report Data |
| Xilinx ISE PIN2UCF Report Data |
| rpy | RenPy Script |
| rpyb | RenPy Bytecode |
| rpyc | RenPy Compiled Script |
| rpym | RenPy Module |
| rpymc | RenPy Module |
| rqb | RapidQ Quellcode Data |
| rqc | Micro Focus Revolve Compiled Script |
| rqs | Micro Focus Revolve Script |
| rr2 | Radare2 Debug Profile Data |
| rrc | BlackBerry Resource Content |
| rrh | BlackBerry Resource Header |
| rs | Amiga Reassembler ReSource Data |
| Rust Source Code |
| rsc | Pegasus Mail Compiled Resource |
| rsd | RealBasic Database |
| rsdk | Retro-Engine SDK Data |
| rsg | SymbianOS Resource Header |
| rsi | Reactis Info File |
| rsl | Robot Scripting Language |
| rsld | Reactis Dynamic Library Cache |
| rslib | ABB RobotStudio Library |
| rsls | Reactis Static Library Cache |
| rsm | Delphi Remote Debugging Symbols Data |
| Reactis Makefile |
| rsnippet | Rsnippet Data |
| rso | Reactis Compiled Object |
| rsp | MSBuild Response File |
| Rapport Script |
| rspag | ABB RobotStudio Pack and Go Archive |
| rsrc | Mac OS X Resource Data |
| rsrs | Buddy API Data |
| rsstn | ABB RobotStudio Station Data |
| rsxm | Reactis Machine State Cache |
| rt | Apache Jena RDF Thrift Data |
| rte | Crestron SIMPL Route Data |
| rts | CA-Realizer Runtime Library |
| Resource Tuner Console Script |
| rtw | Real-Time Workshop File |
| ruby | Ruby Console Application |
| ruf | ProWorx NXT Address Used Tables Reference |
| rul | InstallShield Install Script |
| rule | Visual C++ Project Rules |
| rules | Visual C++ Project Rules |
| run | Softworks Basic Data |
| rur | RUR-PLE Solution |
| rvb | Rhino 3D Visual Basic Script |
| rvf | RichView Format Data |
| rvi | Crestron RoomView Information Data |
| rvo | ER/Studio Comparison Quick Launch Data |
| rvr | RapidPLUS Reviewer Application |
| rvt | Apache Rivet TCL File |
