| nsd | BLAST Nucleotide Database |
| nsd | NRG Systems Symphonie Data |
| nse | NeuraLynx Single Electrode Waveform Data |
| nsf | Lotus Notes Data |
| nsf | Noptel NOS Setup Data |
| nsg | Lotus Notes Database |
| nsg | Nessie Saved State |
| nsh | Lotus Notes NSH Database |
| nsi | BLAST NSI Data |
| nslloc | Mac OS X Finder NSL Location Data |
| nsm | AQUA NOE Distance Restraints Summary Data |
| nsm | NESticle Movie |
| nsmp | Nord User Sample |
| nsp | Nintendo Switch Submission Package |
| nspe | Navicat for SQL Server Exported Table |
| nspl | Netscape Navigator Plug-in |
| nsps | Navicat for SQL Server Structure Synchronization Data |
| nsq | BLAST Sequence Data |
| nsq | NScheduler Data |
| nsr | EMC NetWorker Directive File |
| nsr | Nikon Capture Resolution Data |
| nst | Lotus Notes Template Data |
| nst | NeuraLynx Spike Timestamps Data |
| nsw | EditTools Never Spell Word Data |
| nsx | Apollo HiPer-SIx Database Index |
| nsx | Synology DiskStation Manager Exported Note |
| nsz | NVIDIA nTune Benchmark Data |
| nt2 | NinjaTrader Level 2 Market Replay Data |
| nt3 | JB BAHN Layout Data |
| nt8bk | NinjaTrader Database Backup |
