| rgss | RPG Maker XP Game Archive |
| rgt | Corsixs Mod Studio Texture Data |
| rgt | 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 |
| rif | Mikrotik RouterOS Dump |
| 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 |
