| Extension | File Description |
| .RLB | Uncommon Files |
| .RLC | Uncommon Files |
| .RLD | Uncommon Files |
| .RLE | Raster Image Files |
| .RLELZW | Uncommon Files |
| .RLF | Page Layout Files |
| .RLG | Uncommon Files |
| .RLH | Uncommon Files |
| .RLI | Raster Image Files |
| .RLJ | Uncommon Files |
| .RLK | Uncommon Files |
| .RLL | Settings Files |
| .RLM | Uncommon Files |
| .RLN | Uncommon Files |
| .RLO | Uncommon Files |
| .RLP | Uncommon Files |
| .RLQ | Uncommon Files |
| .RLR | Uncommon Files |
| .RLS | Developer Files |
| .RLT | Uncommon Files |
| .RLU | Uncommon Files |
| .RLV | Uncommon Files |
| .RLW | Uncommon Files |
| .RLX | Uncommon Files |
| .RLY | Uncommon Files |
| .RLZ | Uncommon Files |
| .RM | Video Files |
| .RM0 | Uncommon Files |
| .RM1 | Uncommon Files |
| .RM2 | Uncommon Files |
| .RM3 | Uncommon Files |
| .RM4 | Uncommon Files |
| .RM5 | Uncommon Files |
| .RM6 | Uncommon Files |
| .RM7 | Uncommon Files |
| .RM8 | Uncommon Files |
| .RM9 | Uncommon Files |
| .RMA | Uncommon Files |
| .RMB | Uncommon Files |
| .RMC | Uncommon Files |
| .RMD | Data Files |
| .RME | Uncommon Files |
| .RMF | Audio Files |
| .RMG | Uncommon Files |
| .RMGC | Uncommon Files |
| .RMH | Uncommon Files |
| .RMI | Audio Files |
| .RMID | Uncommon Files |
| .RMIX | Uncommon Files |
| .RMJ | Audio Files |
| .RMK | Uncommon Files |
| .RML | CAD Files |
| .RMM | Audio Files |
| .RMN | Uncommon Files |
| .RMO | Uncommon Files |
| .RMP | Video Files |
| .RMQ | Uncommon Files |
| .RMR | Page Layout Files |
| .RMS | Video Files |
| .RMSKIN | Settings Files |
| .RMT | System Files |
| .RMU | Uncommon Files |
| .RMV | Uncommon Files |
| .RMVB | Video Files |
| .RMW | Uncommon Files |
| .RMX | Data Files |
| .RMY | Uncommon Files |
| .RMZ | Uncommon Files |
| .RN | Uncommon Files |
| .RN0 | Uncommon Files |
| .RN1 | Uncommon Files |
| .RN2 | Uncommon Files |
| .RN3 | Uncommon Files |
| .RN4 | Uncommon Files |
| .RN5 | Uncommon Files |
| Extension | File Description |
| .RN6 | Uncommon Files |
| .RN7 | Uncommon Files |
| .RN8 | Uncommon Files |
| .RN9 | Uncommon Files |
| .RNA | Uncommon Files |
| .RNAM | Uncommon Files |
| .RNB | Uncommon Files |
| .RNC | Compressed Files |
| .RND | Misc Files |
| .RNE | Uncommon Files |
| .RNF | Uncommon Files |
| .RNG | Audio Files |
| .RNH | Uncommon Files |
| .RNI | Uncommon Files |
| .RNJ | Uncommon Files |
| .RNK | Uncommon Files |
| .RNL | Uncommon Files |
| .RNM | Uncommon Files |
| .RNN | Uncommon Files |
| .RNO | Uncommon Files |
| .RNP | Uncommon Files |
| .RNQ | Uncommon Files |
| .RNR | Uncommon Files |
| .RNS | Audio Files |
| .RNT | Uncommon Files |
| .RNU | Uncommon Files |
| .RNV | Uncommon Files |
| .RNW | Uncommon Files |
| .RNX | Settings Files |
| .RNY | Uncommon Files |
| .RNZ | Uncommon Files |
| .RO0 | Uncommon Files |
| .RO1 | Uncommon Files |
| .RO2 | Uncommon Files |
| .RO3 | Uncommon Files |
| .RO4 | Uncommon Files |
| .RO5 | Uncommon Files |
| .RO6 | Uncommon Files |
| .RO7 | Uncommon Files |
| .RO8 | Uncommon Files |
| .RO9 | Uncommon Files |
| .ROA | Data Files |
| .ROADS | Uncommon Files |
| .ROAH | Uncommon Files |
| .ROB | Uncommon Files |
| .ROC | Uncommon Files |
| .ROCK | Plugin Files |
| .ROD | Database Files |
| .ROE | Uncommon Files |
| .ROF | Uncommon Files |
| .ROFF | Uncommon Files |
| .ROG | Uncommon Files |
| .ROH | Uncommon Files |
| .ROI | Data Files |
| .ROIDZ | Uncommon Files |
| .ROJ | Uncommon Files |
| .ROK | Uncommon Files |
| .ROL | Audio Files |
| .ROM | Misc Files |
| .RON | Uncommon Files |
| .ROND | Uncommon Files |
| .ROO | Uncommon Files |
| .ROOT | Uncommon Files |
| .ROP | Uncommon Files |
| .ROQ | Video Files |
| .ROR | Uncommon Files |
| .ROS | Uncommon Files |
| .ROT | Game Files |
| .ROTATE | Uncommon Files |
| .ROU | Data Files |
| .ROUT | Uncommon Files |
| .ROUT2 | Uncommon Files |
| .ROUTINE | Uncommon Files |
| .ROUTINES | Uncommon Files |
| .ROV | Misc Files |
