| nu4 | Norton Utilities DLL Root Data |
| nub | Xerox FreeFlow NUB Init Data |
| nuc | PAML Sequence Data |
| nuf | Symantec Procomm Plus New User Message Data |
| nugg | SAPLink Nugget Data |
| num | DICTION Data |
| Nikon Capture Unsharp Mask |
| nus | NuShell Input |
| nv | MAME NVRAM Data |
| NewViews Database |
| Visicontrol MVS-20 Non-Volatile Memory Backup |
| nv2 | CART Grove Data |
| CART Navigator Data |
| Navionics Chart |
| NewViews v2 Database |
| nv3 | CART Navigator Data |
| Visicontrol MVS-30 Non-Volatile Memory Backup |
| nvc | Nikon Capture Vignette Correction Data |
| nvd | Navidoc Data |
| NetworkView Data |
| nvda | NVDA Data |
| nvda-addon | NVDA Add-on Package |
| nve | MB-System MBnavedit Edited Navigation |
| nvf | Visicontrol MVS-20 Non-Volatile Memory Backup |
| nvg-cht-bin | Novagraph Chartist Binary Data |
| nvg-cht-xml | Novagraph Chartist XML Data |
| nvh | MB-System NVH Project |
| nvi | CARAIBES Navigation Data |
| nvj | Net Vampire Job Data |
| nvl | UniChem Results |
| nvm | PCSX2 Dumped BIOS Configuration File |
| nvp | Net Vampire Job |
| Nvidia Control Panel Profile |
| nvr | NeverForget Reminder Data |
| nvram | VMware Virtual Machine NVRAM Data |
| nvsg | NVIDIA SceniX Data |
| nvt | NeuraLynx Video Tracker Data |
| 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 |
| Nikon Capture White Balance Data |
| nwbak | NeatWorks Database Backup |
| nwc | NavisWorks Cache File |
| 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 |
| nwid | NeoEngine Data |
| nwk | Nano Wiki Engine Data |
| nwm | Nisus Writer Pro Macro Data |
| Sony NWM Display Screen |
| nwo | NWChem Output File |
| nwp | NavisWorks Presenter Material Palette |
| NEC-Win Plus Proprietary Format Data |
| Now Contact WP Data |
| nwpd | VivaNWP Designer Template |
| 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 |
| Pioneer Rekordbox Profile |
| nxtheme | Nintendo Switch Theme Data |
| nyf | myBase Database |
| nyl | Novapoint Vertical Alignment Data |
| nym | Sheffield Dictionary Data |
