| nwc | NavisWorks Cache File |
| nwcab | Neat Cabinet |
| nwdb | Neat Database |
| nwelicense | Nisus Writer Pro License Data |
| nwf | FTS Comm Control Data |
| nwg | NetEase Game Replay |
| nwk | Nano Wiki Engine Data |
| nwm | Sony NWM Display Screen |
| nwo | NWChem Output File |
| nwp | NavisWorks Presenter Material Palette |
| nwt | MODFLOW Newton Solver Data |
| nwv | Dragon NaturallySpeaking User Archive |
| nx1 | NexusDB Database |
| nx2 | NexusDB v2 Database |
| 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 |
| nyf | myBase Database |
| nyl | Novapoint Vertical Alignment Data |
| nym | Sheffield Dictionary Data |
| nzl | Corel Painter Nozzle Data |
| nzn | NoteZilla Notes Data |
| nzn | RMCProfile Nitrogen Zinc Neighbours Data |
| o2s | Oracle-to-MySQL Profile Description Data |
| o8c | OCTGN Card Image |
| o8d | OCTGN Deck Data |
