| Extension | File Description |
| .O88 | Uncommon Files |
| .O89 | Uncommon Files |
| .O8A | Uncommon Files |
| .O8B | Uncommon Files |
| .O8C | Uncommon Files |
| .O8D | Uncommon Files |
| .O8E | Uncommon Files |
| .O8F | Uncommon Files |
| .O8G | Uncommon Files |
| .O8H | Uncommon Files |
| .O8I | Uncommon Files |
| .O8J | Uncommon Files |
| .O8K | Uncommon Files |
| .O8L | Uncommon Files |
| .O8M | Uncommon Files |
| .O8N | Uncommon Files |
| .O8O | Uncommon Files |
| .O8P | Uncommon Files |
| .O8Q | Uncommon Files |
| .O8R | Uncommon Files |
| .O8S | Uncommon Files |
| .O8T | Uncommon Files |
| .O8U | Uncommon Files |
| .O8V | Uncommon Files |
| .O8W | Uncommon Files |
| .O8X | Uncommon Files |
| .O8Y | Uncommon Files |
| .O8Z | Uncommon Files |
| .O90 | Uncommon Files |
| .O91 | Uncommon Files |
| .O92 | Uncommon Files |
| .O93 | Uncommon Files |
| .O94 | Uncommon Files |
| .O95 | Uncommon Files |
| .O96 | Uncommon Files |
| .O97 | Uncommon Files |
| .O98 | Uncommon Files |
| .O99 | Uncommon Files |
| .O9A | Uncommon Files |
| .O9B | Uncommon Files |
| .O9C | Uncommon Files |
| .O9D | Uncommon Files |
| .O9E | Uncommon Files |
| .O9F | Uncommon Files |
| .O9G | Uncommon Files |
| .O9H | Uncommon Files |
| .O9I | Uncommon Files |
| .O9J | Uncommon Files |
| .O9K | Uncommon Files |
| .O9L | Uncommon Files |
| .O9M | Uncommon Files |
| .O9N | Uncommon Files |
| .O9O | Uncommon Files |
| .O9P | Uncommon Files |
| .O9Q | Uncommon Files |
| .O9R | Uncommon Files |
| .O9S | Uncommon Files |
| .O9T | Uncommon Files |
| .O9U | Uncommon Files |
| .O9V | Uncommon Files |
| .O9W | Uncommon Files |
| .O9X | Uncommon Files |
| .O9Y | Uncommon Files |
| .O9Z | Uncommon Files |
| .OA0 | Uncommon Files |
| .OA1 | Uncommon Files |
| .OA2 | Game Files |
| .OA3 | Text Files |
| .OA4 | Uncommon Files |
| .OA5 | Uncommon Files |
| .OA6 | Uncommon Files |
| .OA7 | Uncommon Files |
| .OA8 | Uncommon Files |
| .OA9 | Uncommon Files |
| .OAA | Uncommon Files |
| Extension | File Description |
| .OAB | Data Files |
| .OAC | Uncommon Files |
| .OAD | Uncommon Files |
| .OAE | Uncommon Files |
| .OAF | Uncommon Files |
| .OAG | Uncommon Files |
| .OAH | Uncommon Files |
| .OAH2DSK | Uncommon Files |
| .OAI | Uncommon Files |
| .OAJ | Uncommon Files |
| .OAK | Uncommon Files |
| .OAL | Uncommon Files |
| .OAM | Uncommon Files |
| .OAN | Uncommon Files |
| .OAO | Uncommon Files |
| .OAP | Uncommon Files |
| .OAQ | Uncommon Files |
| .OAR | Uncommon Files |
| .OARC | Uncommon Files |
| .OAS | Data Files |
| .OAT | Uncommon Files |
| .OAU | Uncommon Files |
| .OAV | Uncommon Files |
| .OAW | Uncommon Files |
| .OAX | Uncommon Files |
| .OAY | Uncommon Files |
| .OAZ | Uncommon Files |
| .OB | Uncommon Files |
| .OB! | Misc Files |
| .OB$ | Uncommon Files |
| .OB0 | Uncommon Files |
| .OB1 | Uncommon Files |
| .OB2 | Uncommon Files |
| .OB3 | Uncommon Files |
| .OB4 | Uncommon Files |
| .OB5 | Uncommon Files |
| .OB6 | Uncommon Files |
| .OB7 | Uncommon Files |
| .OB8 | Uncommon Files |
| .OB9 | Uncommon Files |
| .OBA | Uncommon Files |
| .OBB | Uncommon Files |
| .OBC | Uncommon Files |
| .OBD | Data Files |
| .OBE | Uncommon Files |
| .OBF | Uncommon Files |
| .OBG | Uncommon Files |
| .OBH | Uncommon Files |
| .OBI | Uncommon Files |
| .OBJ | Data Files |
| .OBJ0 | Uncommon Files |
| .OBJ1 | Uncommon Files |
| .OBJECTS | Uncommon Files |
| .OBK | Uncommon Files |
| .OBL | Uncommon Files |
| .OBM | Uncommon Files |
| .OBML | Web Files |
| .OBN | Uncommon Files |
| .OBO | Uncommon Files |
| .OBP | 3D Image Files |
| .OBPACK | Uncommon Files |
| .OBQ | Uncommon Files |
| .OBR | Uncommon Files |
| .OBS | Uncommon Files |
| .OBSKIN | Uncommon Files |
| .OBT | Settings Files |
| .OBTHEME | Uncommon Files |
| .OBU | Uncommon Files |
| .OBV | Uncommon Files |
| .OBW | Uncommon Files |
| .OBX | Uncommon Files |
| .OBY | Uncommon Files |
| .OBZ | 3D Image Files |
| .OC0 | Uncommon Files |
| .OC1 | Uncommon Files |
