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| RM | RealMedia File |
| RMD | Microsoft RegMaid Document |
| RMF | Rich Map Format |
| RMI | MIDI Music File |
| RMJ | Real Jukebox File |
| RMK | RMake Make File |
| RMM | RealPlayer File |
| RMX | RealJukeBox MP3 File |
| RNL | GTX Runlength Raster Graphics |
| RND | AutoCAD AutoShade Rendering |
| RNG | Nokia Ringtone File |
| RNX | RealPlayer File |
| ROL | AdLib Music File |
| ROV | Rescue Rover data File |
| RP | RealPix Clip |
| RP1 | R&R Report File |
| RPB | Automotive Diagnostic File |
| RPD | Ashton Tate RapidFile Database |
| RPG | RPG Programming Language |
| RPL | Apple Macintosh Replica Document |
| RPM | RealMedia Player File |
| RPM | RedHat Package Manager Package |
| RPT | Report (various) |
| RPV | Real Player Visualisation File |
| RQY | MS Excel OLE DB Query File |
| RRS | Road Rash Save File |
| RSB | Rogue Spear Bitmap |
| RSC | SymbianOS Application Resource File |
| RSF | Mediafour MacDrive Macintosh Resource Fork |
| RSL | Borderland's Paradox 7 Reports |
| RSL | PC Tools Resources Library |
| RSL | Adobe Pagemaker File |
| RSP | Response Text File (various) |
| RSP | Rockwell Software Logix 5 File |
| RSP | MS ODBC Driver Configuration File |
| RSS | Rockwell Logix 500 SLC-5 Software |
| RT | RealText Clip |
| RTA | RoboHelp Configuration |
| RTF | Rich Text Format |
| RTK | RoboHelp Configuration |
| RTL | Text File |
| RTM | Real Tracker music module (MOD) file |
| RTP | Microsoft Patch File (usually Microsoft VC++), used with RTPATCH.EXE |
| RTP | TurboTax Update File |
| RTS | RealAudio's RTSL Document |
| RTS | RoboHelp Configuration |
| RTX | Rich Text Document |
| RTX | Mobile Phone Ringtone |
| RUL | Expert System Rule |
| RUL | Extension used in InstallShield |
| RUN | PC Tools Script Tools Program |
| RV | RealVideo Clip |
| RVP | Microsoft Scan Configuration File |
| RWS | Inprise (Borland) C++ Resource Workshop Project |
| RWX | Netscape Live 3D |
| RWX | RenderWare |
| RWZ | MS Outlook Rules Wizard File |
| RX | Reflex Database Driver |
| RXD | Borland Reflex Database |
| RXH | Reflex Database Help File |
| RXR | Reflex Database Report |
| RXS | Reflex Database Screen Driver |
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