| Extension | File Description |
| .ROVER | Uncommon Files |
| .ROW | Uncommon Files |
| .ROX | Executable Files |
| .ROY | Uncommon Files |
| .ROZ | Uncommon Files |
| .RP | Data Files |
| .RP0 | Uncommon Files |
| .RP1 | Uncommon Files |
| .RP2 | Game Files |
| .RP3 | Uncommon Files |
| .RP4 | Uncommon Files |
| .RP5 | Uncommon Files |
| .RP6 | Uncommon Files |
| .RP7 | Uncommon Files |
| .RP8 | Uncommon Files |
| .RP9 | Compressed Files |
| .RPA | Data Files |
| .RPB | Settings Files |
| .RPBM | Uncommon Files |
| .RPC | Uncommon Files |
| .RPCP | Uncommon Files |
| .RPD | Data Files |
| .RPE | Uncommon Files |
| .RPF | Game Files |
| .RPG | Uncommon Files |
| .RPGM | Uncommon Files |
| .RPH | Uncommon Files |
| .RPI | Uncommon Files |
| .RPIN | Uncommon Files |
| .RPJ | Executable Files |
| .RPK | Settings Files |
| .RPL | Game Files |
| .RPLN | Uncommon Files |
| .RPM | Compressed Files |
| .RPMS | Uncommon Files |
| .RPN | Uncommon Files |
| .RPNM | Uncommon Files |
| .RPO | Uncommon Files |
| .RPP | Uncommon Files |
| .RPPM | Uncommon Files |
| .RPQ | Uncommon Files |
| .RPR | Uncommon Files |
| .RPS | Settings Files |
| .RPSS | Settings Files |
| .RPST | Settings Files |
| .RPT | Text Files |
| .RPTDESIGN | Uncommon Files |
| .RPTDOCUMEN | Uncommon Files |
| .RPTLIBRARY | Uncommon Files |
| .RPTR | Page Layout Files |
| .RPTTEMPLAT | Uncommon Files |
| .RPU | Uncommon Files |
| .RPV | Uncommon Files |
| .RPW | Uncommon Files |
| .RPX | Uncommon Files |
| .RPY | Game Files |
| .RPYC | Game Files |
| .RPZ | Uncommon Files |
| .RQ | Data Files |
| .RQ0 | Uncommon Files |
| .RQ1 | Uncommon Files |
| .RQ2 | Uncommon Files |
| .RQ3 | Uncommon Files |
| .RQ4 | Uncommon Files |
| .RQ5 | Uncommon Files |
| .RQ6 | Uncommon Files |
| .RQ7 | Uncommon Files |
| .RQ8 | Uncommon Files |
| .RQ9 | Uncommon Files |
| .RQA | Uncommon Files |
| .RQB | Uncommon Files |
| .RQC | Uncommon Files |
| .RQD | Uncommon Files |
| .RQE | Uncommon Files |
| .RQF | Uncommon Files |
| Extension | File Description |
| .RQG | Uncommon Files |
| .RQH | Uncommon Files |
| .RQI | Uncommon Files |
| .RQJ | Uncommon Files |
| .RQK | Uncommon Files |
| .RQL | Uncommon Files |
| .RQM | Uncommon Files |
| .RQN | Uncommon Files |
| .RQO | Uncommon Files |
| .RQP | Uncommon Files |
| .RQQ | Uncommon Files |
| .RQR | Uncommon Files |
| .RQS | Uncommon Files |
| .RQT | Uncommon Files |
| .RQU | Uncommon Files |
| .RQV | Uncommon Files |
| .RQW | Uncommon Files |
| .RQX | Uncommon Files |
| .RQY | Uncommon Files |
| .RQZ | Uncommon Files |
| .RR | Uncommon Files |
| .RR0 | Uncommon Files |
| .RR1 | Uncommon Files |
| .RR2 | Uncommon Files |
| .RR3 | Uncommon Files |
| .RR4 | Uncommon Files |
| .RR5 | Uncommon Files |
| .RR6 | Uncommon Files |
| .RR7 | Uncommon Files |
| .RR8 | Uncommon Files |
| .RR9 | Uncommon Files |
| .RRA | CAD Files |
| .RRB | Uncommon Files |
| .RRC | Uncommon Files |
| .RRD | GIS Files |
| .RRE | Uncommon Files |
| .RRF | Uncommon Files |
| .RRG | Uncommon Files |
| .RRGT | Uncommon Files |
| .RRH | Uncommon Files |
| .RRI | Raster Image Files |
| .RRJ | Uncommon Files |
| .RRK | Uncommon Files |
| .RRL | Uncommon Files |
| .RRM | Uncommon Files |
| .RRN | Uncommon Files |
| .RRO | Uncommon Files |
| .RRP | Uncommon Files |
| .RRQ | Uncommon Files |
| .RRR | Backup Files |
| .RRS | Uncommon Files |
| .RRSE | Uncommon Files |
| .RRT | Data Files |
| .RRU | Uncommon Files |
| .RRV | Uncommon Files |
| .RRW | Uncommon Files |
| .RRX | Uncommon Files |
| .RRY | Uncommon Files |
| .RRZ | Uncommon Files |
| .RS | System Files |
| .RS0 | Uncommon Files |
| .RS1 | Uncommon Files |
| .RS2 | Uncommon Files |
| .RS3 | Uncommon Files |
| .RS4 | Uncommon Files |
| .RS5 | Uncommon Files |
| .RS6 | Uncommon Files |
| .RS6000 | Uncommon Files |
| .RS7 | Uncommon Files |
| .RS8 | Uncommon Files |
| .RS9 | Uncommon Files |
| .RSA | Misc Files |
| .RSAKEY | Uncommon Files |
| .RSB | Raster Image Files |
| .RSC | Data Files |
