| rfg | iNTEGRATOR Data |
| rfh | iNTEGRATOR Householding Data |
| rfi | SPEFO Filtered Data |
| rfl | ANSYS RFL Results Data |
| rfl | RISAFloor Analysis Data |
| rfl8 | Avantes Avasoft v8 Reflectance Mode Data |
| rflw | Adobe Edge Reflow Data File |
| rfn | RoboForm Safenote File |
| rfo | RoboForm Option File |
| rfo | RockFlow Results Data |
| rfp | RoboForm PassCard File |
| rfq | RoboForm SearchCard File |
| rfr | Adobe Photoshop Frame Filter |
| rfs | RealFlow Script |
| 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 |
| rgm | Essence Engine Model Data |
| rgmb | RootsMagic v4 Database Backup |
| rgmc | RootsMagic v4 Database |
| rgn | Garmin Region File |
| rgp | RealArcade Game Package |
| rgrp | Avid Pro Tools Region Group File |
| rgss | RPG Maker XP Game Archive |
| rgt | Intuit Quickbooks Temporary File |
