| Extension | File Description |
| .RHO | Uncommon Files |
| .RHP | Plugin Files |
| .RHQ | Uncommon Files |
| .RHR | Uncommon Files |
| .RHS | Uncommon Files |
| .RHT | Uncommon Files |
| .RHTML | Web Files |
| .RHU | Uncommon Files |
| .RHV | Uncommon Files |
| .RHW | Uncommon Files |
| .RHX | Uncommon Files |
| .RHY | Uncommon Files |
| .RHZ | Uncommon Files |
| .RI | Uncommon Files |
| .RI0 | Uncommon Files |
| .RI1 | Uncommon Files |
| .RI2 | Uncommon Files |
| .RI3 | Uncommon Files |
| .RI4 | Uncommon Files |
| .RI5 | Uncommon Files |
| .RI6 | Uncommon Files |
| .RI7 | Uncommon Files |
| .RI8 | Uncommon Files |
| .RI9 | Uncommon Files |
| .RIA | Uncommon Files |
| .RIB | Uncommon Files |
| .RIC | Raster Image Files |
| .RICHMEDIA | Uncommon Files |
| .RICOCHETLW | Uncommon Files |
| .RICONS | Uncommon Files |
| .RID | Uncommon Files |
| .RIDDLES | Uncommon Files |
| .RIDDLES2F | Uncommon Files |
| .RIDE | Uncommon Files |
| .RIDE2 | Uncommon Files |
| .RIDEOFVALK | Uncommon Files |
| .RIDGE | Uncommon Files |
| .RIE | Uncommon Files |
| .RIF | Raster Image Files |
| .RIFF | Raster Image Files |
| .RIFL | Uncommon Files |
| .RIG | CAD Files |
| .RIGHT | Uncommon Files |
| .RIH | Uncommon Files |
| .RII | Uncommon Files |
| .RIJ | Uncommon Files |
| .RIK | Uncommon Files |
| .RIL | Uncommon Files |
| .RIM | Uncommon Files |
| .RIN | Uncommon Files |
| .RING | Uncommon Files |
| .RIO | Uncommon Files |
| .RIP | Audio Files |
| .RIQ | Uncommon Files |
| .RIR | Uncommon Files |
| .RIS | Text Files |
| .RISCOS | Uncommon Files |
| .RIT | Uncommon Files |
| .RIU | Uncommon Files |
| .RIV | Uncommon Files |
| .RIW | Uncommon Files |
| .RIX | Raster Image Files |
| .RIY | Uncommon Files |
| .RIZ | Uncommon Files |
| .RJ0 | Uncommon Files |
| .RJ1 | Uncommon Files |
| .RJ2 | Uncommon Files |
| .RJ3 | Uncommon Files |
| .RJ4 | Uncommon Files |
| .RJ5 | Uncommon Files |
| .RJ6 | Uncommon Files |
| .RJ7 | Uncommon Files |
| .RJ8 | Uncommon Files |
| .RJ9 | Uncommon Files |
| .RJA | Uncommon Files |
| Extension | File Description |
| .RJB | Uncommon Files |
| .RJC | Uncommon Files |
| .RJD | Uncommon Files |
| .RJE | Uncommon Files |
| .RJF | Uncommon Files |
| .RJG | Uncommon Files |
| .RJH | Uncommon Files |
| .RJI | Uncommon Files |
| .RJJ | Uncommon Files |
| .RJK | Uncommon Files |
| .RJL | Uncommon Files |
| .RJM | Uncommon Files |
| .RJN | Uncommon Files |
| .RJO | Uncommon Files |
| .RJP | Uncommon Files |
| .RJQ | Uncommon Files |
| .RJR | Uncommon Files |
| .RJS | Web Files |
| .RJT | Uncommon Files |
| .RJU | Uncommon Files |
| .RJV | Uncommon Files |
| .RJW | Uncommon Files |
| .RJX | Uncommon Files |
| .RJY | Uncommon Files |
| .RJZ | Uncommon Files |
| .RK | Compressed Files |
| .RK0 | Uncommon Files |
| .RK1 | Uncommon Files |
| .RK2 | Uncommon Files |
| .RK3 | Uncommon Files |
| .RK4 | Uncommon Files |
| .RK5 | Uncommon Files |
| .RK6 | Uncommon Files |
| .RK7 | Uncommon Files |
| .RK8 | Uncommon Files |
| .RK9 | Uncommon Files |
| .RKA | Uncommon Files |
| .RKB | Uncommon Files |
| .RKC | Uncommon Files |
| .RKD | Uncommon Files |
| .RKE | Uncommon Files |
| .RKF | Uncommon Files |
| .RKG | Uncommon Files |
| .RKH | Uncommon Files |
| .RKI | Uncommon Files |
| .RKJ | Uncommon Files |
| .RKK | Uncommon Files |
| .RKL | Uncommon Files |
| .RKM | Uncommon Files |
| .RKN | Uncommon Files |
| .RKO | Uncommon Files |
| .RKP | Game Files |
| .RKQ | Uncommon Files |
| .RKR | Uncommon Files |
| .RKS | Uncommon Files |
| .RKT | Uncommon Files |
| .RKU | Uncommon Files |
| .RKV | Uncommon Files |
| .RKW | Uncommon Files |
| .RKX | Uncommon Files |
| .RKY | Uncommon Files |
| .RKZ | Uncommon Files |
| .RL | Data Files |
| .RL$ | Uncommon Files |
| .RL0 | Uncommon Files |
| .RL1 | Uncommon Files |
| .RL2 | Uncommon Files |
| .RL3 | Uncommon Files |
| .RL4 | Uncommon Files |
| .RL5 | Uncommon Files |
| .RL6 | Uncommon Files |
| .RL7 | Uncommon Files |
| .RL8 | Uncommon Files |
| .RL9 | Uncommon Files |
| .RLA | Uncommon Files |
