| nwt | MODFLOW Newton Solver Data |
| nwv | Dragon NaturallySpeaking User Archive |
| nx1 | NexusDB Database |
| nx2 | NexusDB v2 Database |
| nxb | Nexus Race Software RAW Data |
| nxe | LonWorks Neuron Application Image File |
| nxi | Kaseya Network Monitoring Statistic Index |
| nxl | NextLabs SkyDRM Encrypted Data |
| nxm | Nexus Mod Manager Link |
| nxp | NEXUS Expansion Pack |
| nxr | Kaseya Network Monitoring Statistic Data |
| nxs | NEXUS Data File |
| nxs | Pioneer Rekordbox Profile |
| nxtheme | Nintendo Switch Theme Data |
| nyf | myBase Database |
| nyl | Novapoint Vertical Alignment Data |
| nym | Sheffield Dictionary Data |
| nyt | Times Reader Article Data |
| nzl | Corel Painter Nozzle Data |
| nzn | NoteZilla Notes Data |
| nzn | RMCProfile Nitrogen Zinc Neighbours Data |
| o2s | Oracle-to-MySQL Profile Description Data |
| o3 | Ozone Messenger Program Support File |
| o3d | Google Open 3D Data |
| o8c | OCTGN Card Image |
| o8d | OCTGN Deck Data |
| o8g | OCTGN Game Definition Data |
| o8o | Mediator 5 Repository Tabs Data |
| o8s | OCTGN Set Data |
| oa | Cadence OrCAD OpenAccess Data |
