| nt3 | JB BAHN Layout Data |
| ntar | Network Trace And Retrieval Dump |
| ntb | Tecplot License Data |
| ntd | NinjaTrader Database |
| nte | Holonote Note |
| ntf | Lotus Notes Template |
| ntfp | Nitro File Palette |
| ntft | Nitro File Tiles |
| ntg | NTGsim Data |
| ntm | NinjaTrader Market Replay Data |
| ntm | Navitel 2.0 Map |
| nto | NTOScanner Data |
| 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 | NewViews v2 Database |
| nv2 | CART Navigator Data |
| nv2 | Navionics Chart |
| nv2 | CART Grove Data |
| 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 | Nvidia Control Panel Profile |
| nvp | Net Vampire Job |
| nvr | NeverForget Reminder Data |