| nvram | VMware Virtual Machine NVRAM Data |
| nvsg | NVIDIA SceniX Data |
| nvt | NeuraLynx Video Tracker Data |
| nvt | Novelty Template |
| nvu | Nvidia Driver Package Data |
| nvx2 | Nebula v2 Mesh Resource Data |
| nw | NWChem Input File |
| nw3 | Novell NetWare 3 Data |
| nw4 | Novell NetWare 4 Data |
| nwa | WindowBlinds Natural Windows Animation |
| nwb | Network Workbench Data |
| nwb | Nikon Capture White Balance Data |
| nwbak | NeatWorks Database Backup |
| nwc | NavisWorks Cache File |
| nwc | NetSim Multiple Device Configuration Data |
| 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 |
