| ntk | Nortek Vectrino Profiler Data |
| ntm | Navitel 2.0 Map |
| ntm | NinjaTrader Market Replay Data |
| nto | NTOScanner Data |
| ntr | Netrun Executable List |
| nts | NeuraLynx Single Stereotrode Data |
| ntt | NeuraLynx Single Tetrode Data |
| ntv | PatternSmith Native |
| ntw | Lode Data DA Network |
| ntx | CARIS Marine Navigation Data |
| ntx | Clipper Database Index |
| ntz | InVircible Antivirus Directory Integrity Information Data |
| nu3 | Norton Utilities Backup Data |
| 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 | Nikon Capture Unsharp Mask |
| nus | NuShell Input |
| nv | MAME NVRAM Data |
| nv | NewViews Database |
| nv2 | CART Grove Data |
| nv2 | CART Navigator Data |
| nv2 | Navionics Chart |
| nv2 | NewViews v2 Database |
| nv3 | CART Navigator Data |
| nvc | Nikon Capture Vignette Correction Data |
| nvd | NetworkView Data |
| nvda-addon | NVDA Add-on Package |
| nve | MB-System MBnavedit Edited Navigation |
| nvg-cht-bin | Novagraph Chartist Binary Data |
| nvg-cht-xml | Novagraph Chartist XML Data |
| nvh | MB-System NVH Project |
| nvi | CARAIBES Navigation Data |
