| reu | C64 REU Image |
| rew | MRMC State Rewards Data |
| rewi | MRMC Impulse Rewards Data |
| rf1 | Retirement Forecast Data |
| rf5 | Tektronix RFXpress RF5 Record Data |
| rfa | Autodesk Revit Family File |
| rfb | RoboForm Bookmark File |
| rfc | RoboForm Contact File |
| rff | Roproc Format File Data |
| rfg | iNTEGRATOR Data |
| rflw | Adobe Edge Reflow Data File |
| rfn | RoboForm Safenote File |
| rfo | RoboForm Option File |
| rfp | RoboForm PassCard File |
| rfq | RoboForm SearchCard File |
| rfr | Adobe Photoshop Frame Filter |
| rfs | Samsung RFS Image |
| rft | RoboForm Identity File |
| rft | Autodesk Revit Family Template |
| rftmap | IBM Rational Functional Tester Object Map |
| rfv | Restricted Focus Viewer Input Data |
| rfx | RoboForm Blocking Passcards File |
| rgd | Rosegarden Device Definition |
| 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 |
| rgv | Borland Caliber Requirement Grid Filter |
