| rno | PDP-10 Runoff Input Data |
| rns | Raynen-Qili Shoe Design System Machine Data |
| rnt | EdgeCAM Licensing Data |
| rnt | RightNote Notebook |
| rnx | RealPlayer RNX Data |
| roc | SpaceCAD Rocket Model |
| roca | RIB Office Compressed Archive |
| rod | Ancestry Genealogical Database |
| rod | RIB Office Database |
| rod | Siebel Report Object Design |
| rodx | Ancestry Genealogical Database |
| rodz | Ancestry Genealogical Database |
| rog | Roger 2 Input Data |
| roh | Avantes USB Spectrometer Data |
| roi | Actuate e.Report Designer Report Data |
| roi | ENVI Region of Interest Data |
| roi | MotionTracking Regions of Interest Data |
| roi | Shark ROI System Data |
| roi | Siebel Report Object Instance |
| rok | Roku HD1000 Firmware Update |
| roku | Roku HD1000 Firmware Update |
| rol | Actuate e.Report Designer Report Object Library |
| rol | Siebel Report Object Library |
| rom | AMI BIOS Firmware Update |
| rom | Atari Jaguar ROM Image |
| rom | General ROM Image |
| rom | NES ROM Image |
| roo | Oracle CODASYL DBMS Database Root |
| root | HippoDraw ROOT Ntuples |
| rop | Actuate e.Report Parameter Template |
