| rfs | Samsung RFS Image |
| rft | Autodesk Revit Family Template |
| rft | RoboForm Identity File |
| rftmap | IBM Rational Functional Tester Object Map |
| rfv | Restricted Focus Viewer Input Data |
| rfx | RoboForm Blocking Passcards File |
| rgd | Rosegarden Device Definition |
| rgi | RealArcade Game Installer |
| rgmb | RootsMagic v4 Database Backup |
| rgmc | RootsMagic v4 Database |
| rgn | Garmin Region File |
| rgp | RealArcade Game Package |
| rgrp | Avid Pro Tools Region Group File |
| rgt | Intuit Quickbooks Temporary File |
| 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 |
| ri | Lotus 1-2-3 Data File |
| rib | RenderMan RIB 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 |
| 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 |