| .nscr |
Nintendo DS Title Screen File |
| .nlpx |
NoLimits Package |
| .neosave |
Neopets Save File |
| .osz |
Osu! Beatmap File |
| .odf |
OpenDocument Formula |
| .opt |
Opterecenja File |
| .omod |
Oblivion Mod Archive |
| .osr |
Osu! Replay File |
| .osk |
Osu! Skin File |
| .ovh |
OMSI Vehicle Configuration File |
| .ovl |
Rollercoaster Tycoon 3 Data File |
| .ogz |
Cube 2 Map File |
| .osb |
Osu! Storyboard File |
| .osu |
Osu! Script |
| .pkg |
Package File |
| .prg |
PC-DMIS Part Program File |
| .prx |
PSP Plugin File |
| .pk3 |
Quake 3 Engine Game Data File |
| .properties |
Minecraft Properties File |
| .pln |
ArchiCAD Project File |
| .pod |
Terminal Reality Game Data File |
| .package |
Electronic Arts Game Package File |
| .pgn |
Portable Game Notation File |
| .pet |
WangReal Engine Game Model File |