| nspe | Navicat for SQL Server Exported Table |
| nsps | Navicat for SQL Server Structure Synchronization Data |
| nsr | EMC NetWorker Directive File |
| nsx | Apollo HiPer-SIx Database Index |
| nt2 | NinjaTrader Level 2 Market Replay Data |
| 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 | CART Navigator Data |
| nv2 | NewViews v2 Database |
| nv2 | CART Grove Data |
| nv2 | Navionics Chart |
