| ntr | Netrun Executable List |
| ntv | PatternSmith Native |
| ntw | Lode Data DA Network |
| ntx | Clipper Database Index |
| nub | Xerox FreeFlow NUB Init Data |
| nuc | PAML Sequence Data |
| num | Nikon Capture Unsharp Mask |
| nus | NuShell Input |
| nv | NewViews Database |
| nv2 | Navionics Chart |
| nv2 | CART Navigator Data |
| nv2 | CART Grove Data |
| nv2 | NewViews v2 Database |
| nv3 | CART Navigator Data |
| nvd | NetworkView Data |
| nvda-addon | NVDA Add-on Package |
| nve | MB-System MBnavedit Edited Navigation |
| nvi | CARAIBES Navigation Data |
| nvl | UniChem Results |
| nvm | PCSX2 Dumped BIOS Configuration File |
| 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 |