| Extension | File Description |
| .R89 | Uncommon Files |
| .R8A | Uncommon Files |
| .R8B | Uncommon Files |
| .R8C | Uncommon Files |
| .R8D | Uncommon Files |
| .R8E | Uncommon Files |
| .R8F | Uncommon Files |
| .R8G | Uncommon Files |
| .R8H | Uncommon Files |
| .R8I | Uncommon Files |
| .R8J | Uncommon Files |
| .R8K | Uncommon Files |
| .R8L | Uncommon Files |
| .R8M | Uncommon Files |
| .R8N | Uncommon Files |
| .R8O | Uncommon Files |
| .R8P | Uncommon Files |
| .R8Q | Uncommon Files |
| .R8R | Uncommon Files |
| .R8S | Uncommon Files |
| .R8T | Uncommon Files |
| .R8U | Uncommon Files |
| .R8V | Uncommon Files |
| .R8W | Uncommon Files |
| .R8X | Uncommon Files |
| .R8Y | Uncommon Files |
| .R8Z | Uncommon Files |
| .R90 | Uncommon Files |
| .R91 | Uncommon Files |
| .R92 | Uncommon Files |
| .R93 | Uncommon Files |
| .R94 | Uncommon Files |
| .R95 | Uncommon Files |
| .R96 | Uncommon Files |
| .R97 | Uncommon Files |
| .R98 | Uncommon Files |
| .R99 | Uncommon Files |
| .R9A | Uncommon Files |
| .R9B | Uncommon Files |
| .R9C | Uncommon Files |
| .R9D | Uncommon Files |
| .R9E | Uncommon Files |
| .R9F | Uncommon Files |
| .R9G | Uncommon Files |
| .R9H | Uncommon Files |
| .R9I | Uncommon Files |
| .R9J | Uncommon Files |
| .R9K | Uncommon Files |
| .R9L | Uncommon Files |
| .R9M | Uncommon Files |
| .R9N | Uncommon Files |
| .R9O | Uncommon Files |
| .R9P | Uncommon Files |
| .R9Q | Uncommon Files |
| .R9R | Uncommon Files |
| .R9S | Uncommon Files |
| .R9T | Uncommon Files |
| .R9U | Uncommon Files |
| .R9V | Uncommon Files |
| .R9W | Uncommon Files |
| .R9X | Uncommon Files |
| .R9Y | Uncommon Files |
| .R9Z | Uncommon Files |
| .RA | Audio Files |
| .RA0 | Uncommon Files |
| .RA1 | Uncommon Files |
| .RA2 | Uncommon Files |
| .RA3 | Uncommon Files |
| .RA4 | Uncommon Files |
| .RA5 | Uncommon Files |
| .RA6 | Uncommon Files |
| .RA7 | Uncommon Files |
| .RA8 | Uncommon Files |
| .RA9 | Uncommon Files |
| .RAA | Uncommon Files |
| Extension | File Description |
| .RAB | Uncommon Files |
| .RABBIT | Uncommon Files |
| .RAC | Uncommon Files |
| .RAD | 3D Image Files |
| .RADIOREVOL | Uncommon Files |
| .RAE | Uncommon Files |
| .RAF | Raster Image Files |
| .RAG | Uncommon Files |
| .RAH | Uncommon Files |
| .RAI | Uncommon Files |
| .RAIDERS | Uncommon Files |
| .RAIL | Uncommon Files |
| .RAINDROPPI | Uncommon Files |
| .RAINY | Uncommon Files |
| .RAJ | Uncommon Files |
| .RAK | Uncommon Files |
| .RAL | Data Files |
| .RAM | Audio Files |
| .RAMBLOCKS | Uncommon Files |
| .RAMCARD | Uncommon Files |
| .RAMDISK | Uncommon Files |
| .RAMSON | Uncommon Files |
| .RAN | Uncommon Files |
| .RAO | Uncommon Files |
| .RAP | Uncommon Files |
| .RAPP | Uncommon Files |
| .RAQ | Uncommon Files |
| .RAR | Compressed Files |
| .RARENX | Uncommon Files |
| .RAS | Game Files |
| .RASMOL | Uncommon Files |
| .RASMOLRC | Uncommon Files |
| .RAST | Uncommon Files |
| .RASTER | Uncommon Files |
| .RAT | Misc Files |
| .RATDVD | Disk Image Files |
| .RATES | Uncommon Files |
| .RAU | Uncommon Files |
| .RAV | Developer Files |
| .RAW | Raster Image Files |
| .RAX | Audio Files |
| .RAY | 3D Image Files |
| .RAZ | Uncommon Files |
| .RB | Developer Files |
| .RB0 | Uncommon Files |
| .RB1 | Uncommon Files |
| .RB2 | Uncommon Files |
| .RB3 | Uncommon Files |
| .RB4 | Settings Files |
| .RB5 | Uncommon Files |
| .RB6 | Uncommon Files |
| .RB7 | Uncommon Files |
| .RB8 | Uncommon Files |
| .RB9 | Uncommon Files |
| .RBA | Uncommon Files |
| .RBB | Uncommon Files |
| .RBBAS | Uncommon Files |
| .RBC | Backup Files |
| .RBD | Uncommon Files |
| .RBE | Uncommon Files |
| .RBF | Backup Files |
| .RBFRM | Uncommon Files |
| .RBG | Uncommon Files |
| .RBH | Uncommon Files |
| .RBI | Uncommon Files |
| .RBJ | Uncommon Files |
| .RBK | Backup Files |
| .RBL | Uncommon Files |
| .RBM | Uncommon Files |
| .RBMNU | Uncommon Files |
| .RBN | Uncommon Files |
| .RBO | Uncommon Files |
| .RBP | Developer Files |
| .RBPM | Uncommon Files |
| .RBQ | Uncommon Files |
