| rfd | Recogniform Form Designer Data |
| RockFlow Simulation Data |
| rfe | RockFlow Log |
| rff | Roproc Format File Data |
| rfg | iNTEGRATOR Data |
| rfh | iNTEGRATOR Householding Data |
| rfi | SPEFO Filtered Data |
| rfl | ANSYS RFL Results Data |
| Novell GroupWise Guardian Database Roll-forward Data |
| RISAFloor Analysis Data |
| rfl8 | Avantes Avasoft v8 Reflectance Mode Data |
| rflw | Adobe Edge Reflow Data File |
| rfn | RoboForm Safenote File |
| rfo | RoboForm Option File |
| RockFlow Results Data |
| rfp | RoboForm PassCard File |
| rfq | RoboForm SearchCard File |
| rfr | Adobe Photoshop Frame Filter |
| rfs | RealFlow Script |
| Samsung RFS Image |
| rft | Autodesk Revit Family Template |
| RoboForm Identity File |
| rftmap | IBM Rational Functional Tester Object Map |
| rfv | Restricted Focus Viewer Input Data |
| rfx | RoboForm Blocking Passcards File |
| rgaim | ReliaSoft RGA Import Template |
| rgd | Rosegarden Device Definition |
| rgf | Advanced Registry Tracer Scan Data |
| rgi | RealArcade Game Installer |
| rgm | Essence Engine Model Data |
| rgmb | RootsMagic v4 Database Backup |
| rgmc | RootsMagic v4 Database |
| rgn | Garmin Region File |
| rgp | RealArcade Game Package |
| rgrid | Rep Plus RepGrid Script |
| rgrp | Avid Pro Tools Region Group File |
| rgss | RPG Maker XP Game Archive |
| rgt | Corsixs Mod Studio Texture Data |
| Intuit Quickbooks Temporary File |
| rgu | Windows Mobile Registry Entry Data |
| rguninst | RealArcade Uninstall Script |
| rgv | Borland Caliber Requirement Grid Filter |
| rh | Deep Exploration 3D Data |
| 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 |
| Mikrotik RouterOS Dump |
| Requirements Interchange Format Data |
| Resource Interchange File Format |
| riff | Resource Interchange File Format |
| rifl | Business Integrator Real-Time Integration Flow Language Script |
| rig | Lightwave 3D RIG Function Data |
| rinex | Receiver Independent Exchange Format Data |
| rio | OMICRON Test Universe RIO Object |
| rip | Lotus Notes Error Data |
| 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 |
| rjs | RealJukebox Skin 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 |
| rkv | eXtendable Wad Editor RKV Data |
| rky | SDLX Registration Key Data |
| rl | R.viewer List Data |
| XML Resource Lists Data |
