| rgt | Intuit Quickbooks Temporary File |
| rgu | Windows Mobile Registry Entry Data |
| rguninst | RealArcade Uninstall Script |
| rgv | Borland Caliber Requirement Grid Filter |
| rh7 | PCAnywhere Remote History Log |
| rha | Adobe RoboHelp AIR Help Project |
| rhd | Standard Intan RHD2000 Header Data |
| rhf | Adobe RoboHelp for FrameMaker Project |
| rhm | Deep Exploration Material Data |
| rhr | Script Rehearser Script Data |
| rhs | Altair FEKO Right Hand Side Vector Data |
| ri | Lotus 1-2-3 Data File |
| rib | RenderMan RIB Data |
| ribbons | Ribbons Data |
| rif | FRAMES Receptor Intakes File |
| riff | Resource Interchange File Format |
| rinex | Receiver Independent Exchange Format Data |
| rio | OMICRON Test Universe RIO Object |
| rir | RIR Statistics Exchange Format Data |
| rir8 | Avantes Avasoft v8 Relative Irradiance Mode Data |
| riscos | RISC OS Data |
| rit | DriveClone Data File |
| riv | CRiSP Harvest Data |
| rjt | RealJukebox Track Info Style |
| rki | Race-Keeper Video Index Data |
| rkl | VST-AU Alpha JUNO Editor License Key Data |
| rkn | Reckon Personal Plus Backup Data |
| rkp | RemoteKeys Profile Data |
| rkplr | NI REAKTOR Player Data |
| rks | SOBEK Rainfall Series Data |
| rky | SDLX Registration Key Data |
| rl | R.viewer List Data |
| rl1 | RL-1 Database Data |
| rl7 | PCAnywhere Remote Session Log |
| rld | RecLoad Definition |
