| 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 |
| rop | PSS/E OPF Model |
| ror | Resources of a Resource File |
| ros | Actuate e.Report Designer Search Definition Data |
| ros | Dynamite VSP Rail Object Style Data |
| ros | Lotus Notes Full Text Index Data |
| rot | Rotater 3D Data |
| rot | STK Central Body Rotation File |
| rou | EnRoute v3 Toolpath Data |
| rou | Route 66 Route Data |
| rov | Actuate e.Report Designer Report Object Value Data |
| rov | Siebel Report Object Variable |
| row | RowPro Row Data |
| rox | Siebel Report Object Executable |
| roz | aSc Timetables Data |
| rp1 | R&R Report Writer DOS XBase Report Library |
| rp2 | R&R Report Writer DOS Worksheets Report Library |
| rp2 | RetroPlatform Player Archive |
| rp3 | R&R Report Writer DOS SQL Report Library |
| rp4 | R&R Report Writer DOS Paradox Report Library |
| rp5 | R&R Report Writer XBase Report Library |
