| Extension | File Description |
| .ROW | Uncommon Files |
| .ROY | Uncommon Files |
| .ROZ | Uncommon Files |
| .RP0 | Uncommon Files |
| .RP1 | Uncommon Files |
| .RP3 | Uncommon Files |
| .RP4 | Uncommon Files |
| .RP5 | Uncommon Files |
| .RP6 | Uncommon Files |
| .RP7 | Uncommon Files |
| .RP8 | Uncommon Files |
| .RPBM | Uncommon Files |
| .RPC | Uncommon Files |
| .RPCP | Uncommon Files |
| .RPE | Uncommon Files |
| .RPG | Uncommon Files |
| .RPGM | Uncommon Files |
| .RPH | Uncommon Files |
| .RPI | Uncommon Files |
| .RPIN | Uncommon Files |
| .RPLN | Uncommon 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 |
| .RPTDESIGN | Uncommon Files |
| .RPTDOCUMEN | Uncommon Files |
| .RPTLIBRARY | Uncommon Files |
| .RPTTEMPLAT | Uncommon Files |
| .RPU | Uncommon Files |
| .RPV | Uncommon Files |
| .RPW | Uncommon Files |
| .RPX | Uncommon Files |
| .RPZ | Uncommon 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 |
| .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 |
| Extension | File Description |
| .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 |
| .RRB | Uncommon Files |
| .RRC | Uncommon Files |
| .RRE | Uncommon Files |
| .RRF | Uncommon Files |
| .RRG | Uncommon Files |
| .RRGT | Uncommon Files |
| .RRH | Uncommon 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 |
| .RRS | Uncommon Files |
| .RRSE | Uncommon Files |
| .RRU | Uncommon Files |
| .RRV | Uncommon Files |
| .RRW | Uncommon Files |
| .RRX | Uncommon Files |
| .RRY | Uncommon Files |
| .RRZ | Uncommon 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 |
| .RSAKEY | Uncommon Files |
| .RSE | Uncommon Files |
| .RSG | Uncommon Files |
| .RSH | Uncommon Files |
| .RSI | Uncommon Files |
| .RSJ | Uncommon Files |
| .RSK | Uncommon Files |
| .RSL | Uncommon Files |
| .RSML | Uncommon Files |
| .RSN | Uncommon Files |
| .RSO | Uncommon Files |
| .RSOUND | Uncommon Files |
| .RSQ | Uncommon Files |
| .RSRT | Uncommon Files |
| .RSTRNT | Uncommon Files |
| .RSU | Uncommon Files |
| .RSV | Uncommon Files |
| .RSX | Uncommon Files |
| .RSY | Uncommon Files |
| .RSZ | Uncommon Files |
| .RS_ | Uncommon Files |
| .RT$ | Uncommon Files |
| .RT0 | Uncommon Files |
| .RT1 | Uncommon Files |
| .RT2 | Uncommon Files |
| .RT3 | Uncommon Files |
| .RT4 | Uncommon Files |
| .RT5 | Uncommon Files |
| .RT6 | Uncommon Files |
| .RT7 | Uncommon Files |
| .RT8 | Uncommon Files |
