| nvp | Net Vampire Job |
| nvp | Nvidia Control Panel Profile |
| nvr | NeverForget Reminder Data |
| nvram | VMware Virtual Machine NVRAM Data |
| nvt | Novelty Template |
| nvx2 | Nebula v2 Mesh Resource Data |
| nw | NWChem Input File |
| nwa | WindowBlinds Natural Windows Animation |
| nwb | Network Workbench Data |
| nwbak | NeatWorks Database Backup |
| nwc | NavisWorks Cache File |
| nwcab | Neat Cabinet |
| nwdb | Neat Database |
| nwelicense | Nisus Writer Pro License Data |
| nwg | NetEase Game Replay |
| nwk | Nano Wiki Engine Data |
| nwo | NWChem Output File |
| nwp | NavisWorks Presenter Material Palette |
| nwv | Dragon NaturallySpeaking User Archive |
| nx1 | NexusDB Database |
| nx2 | NexusDB v2 Database |
| nxe | LonWorks Neuron Application Image File |
| nxl | NextLabs SkyDRM Encrypted Data |
| nxm | Nexus Mod Manager Link |
| nxp | NEXUS Expansion Pack |
| nxs | NEXUS Data File |
| nyf | myBase Database |
| nyl | Novapoint Vertical Alignment Data |
| nym | Sheffield Dictionary Data |
| oa | OpenAccess Database |
