| Extension | File Description |
| .OKQ | Uncommon Files |
| .OKR | Uncommon Files |
| .OKS | Uncommon Files |
| .OKU | Uncommon Files |
| .OKV | Uncommon Files |
| .OKW | Uncommon Files |
| .OKX | Uncommon Files |
| .OKY | Uncommon Files |
| .OKZ | Uncommon Files |
| .OL0 | Uncommon Files |
| .OL1 | Uncommon Files |
| .OL2 | Uncommon Files |
| .OL3 | Uncommon Files |
| .OL4 | Uncommon Files |
| .OL5 | Uncommon Files |
| .OL6 | Uncommon Files |
| .OL7 | Uncommon Files |
| .OL8 | Uncommon Files |
| .OL9 | Uncommon Files |
| .OLA | Uncommon Files |
| .OLC | Uncommon Files |
| .OLDEST | Uncommon Files |
| .OLE | Uncommon Files |
| .OLF | Uncommon Files |
| .OLG | Uncommon Files |
| .OLH | Uncommon Files |
| .OLI | Uncommon Files |
| .OLJ | Uncommon Files |
| .OLL | Uncommon Files |
| .OLLIEFONT | Uncommon Files |
| .OLM | Uncommon Files |
| .OLN | Uncommon Files |
| .OLO | Uncommon Files |
| .OLP | Uncommon Files |
| .OLQ | Uncommon Files |
| .OLR | Uncommon Files |
| .OLRW | Uncommon Files |
| .OLS | Uncommon Files |
| .OLSR | Uncommon Files |
| .OLU | Uncommon Files |
| .OLV | Uncommon Files |
| .OLW | Uncommon Files |
| .OLX | Uncommon Files |
| .OLY | Uncommon Files |
| .OLZ | Uncommon Files |
| .OM | Uncommon Files |
| .OM0 | Uncommon Files |
| .OM1 | Uncommon Files |
| .OM2 | Uncommon Files |
| .OM3 | Uncommon Files |
| .OM4 | Uncommon Files |
| .OM5 | Uncommon Files |
| .OM6 | Uncommon Files |
| .OM7 | Uncommon Files |
| .OM8 | Uncommon Files |
| .OM9 | Uncommon Files |
| .OMB | Uncommon Files |
| .OMC | Uncommon Files |
| .OMD | Uncommon Files |
| .OME | Uncommon Files |
| .OMH | Uncommon Files |
| .OMI | Uncommon Files |
| .OMJ | Uncommon Files |
| .OMK | Uncommon Files |
| .OML | Uncommon Files |
| .OMM | Uncommon Files |
| .OMN | Uncommon Files |
| .OMQ | Uncommon Files |
| .OMR | Uncommon Files |
| .OMS | Uncommon Files |
| .OMT | Uncommon Files |
| .OMU | Uncommon Files |
| .OMV | Uncommon Files |
| .OMW | Uncommon Files |
| .OMY | Uncommon Files |
| Extension | File Description |
| .OMZ | Uncommon Files |
| .ON | Uncommon Files |
| .ON0 | Uncommon Files |
| .ON1 | Uncommon Files |
| .ON2 | Uncommon Files |
| .ON3 | Uncommon Files |
| .ON4 | Uncommon Files |
| .ON5 | Uncommon Files |
| .ON6 | Uncommon Files |
| .ON7 | Uncommon Files |
| .ON8 | Uncommon Files |
| .ON9 | Uncommon Files |
| .ONA | Uncommon Files |
| .ONB | Uncommon Files |
| .ONC | Uncommon Files |
| .ONF | Uncommon Files |
| .ONG | Uncommon Files |
| .ONH | Uncommon Files |
| .ONI | Uncommon Files |
| .ONJ | Uncommon Files |
| .ONK | Uncommon Files |
| .ONL | Uncommon Files |
| .ONLINE | Uncommon Files |
| .ONM | Uncommon Files |
| .ONN | Uncommon Files |
| .ONO | Uncommon Files |
| .ONP | Uncommon Files |
| .ONQ | Uncommon Files |
| .ONR | Uncommon Files |
| .ONS | Uncommon Files |
| .ONT | Uncommon Files |
| .ONU | Uncommon Files |
| .ONV | Uncommon Files |
| .ONW | Uncommon Files |
| .ONX | Uncommon Files |
| .ONY | Uncommon Files |
| .ONZ | Uncommon Files |
| .OO | Uncommon Files |
| .OO0 | Uncommon Files |
| .OO1 | Uncommon Files |
| .OO2 | Uncommon Files |
| .OO3 | Uncommon Files |
| .OO4 | Uncommon Files |
| .OO5 | Uncommon Files |
| .OO6 | Uncommon Files |
| .OO7 | Uncommon Files |
| .OO8 | Uncommon Files |
| .OO9 | Uncommon Files |
| .OOA | Uncommon Files |
| .OOB | Uncommon Files |
| .OOC | Uncommon Files |
| .OOD | Uncommon Files |
| .OOE | Uncommon Files |
| .OOF | Uncommon Files |
| .OOG | Uncommon Files |
| .OOH | Uncommon Files |
| .OOI | Uncommon Files |
| .OOJ | Uncommon Files |
| .OOK | Uncommon Files |
| .OOL | Uncommon Files |
| .OOM | Uncommon Files |
| .OON | Uncommon Files |
| .OOO | Uncommon Files |
| .OOP | Uncommon Files |
| .OOQ | Uncommon Files |
| .OOR | Uncommon Files |
| .OOS | Uncommon Files |
| .OOT | Uncommon Files |
| .OOU | Uncommon Files |
| .OOV | Uncommon Files |
| .OOW | Uncommon Files |
| .OOX | Uncommon Files |
| .OOY | Uncommon Files |
| .OOZ | Uncommon Files |
| .OP | Uncommon Files |
