| nqst | SoundEdit Data |
| nr-vmp | BrainVoyager QX Native Resolution Volume Map |
| nrbak | NeatReceipts Backup Data |
| nrc | AQUA NOE Distance Restraints Counts Data |
| nrd | NeuraLynx RAW Data |
| nrf | Lotus Notes Redirect File |
| nrf | Neat Document Folder File |
| nrkt | NI REAKTOR User Presets Data |
| nrm | Lucene Norms File |
| nrmlib | Neat Cabinet File |
| nrp | ASP.NET Report Maker Report |
| nrrd | Nearly Raw Raster Data |
| nrt | Neat 3 Legacy Contacts Data |
| nrv | AQUA NOE Distance Restraints Violations Data |
| nrx | Neat Receipt Folder File |
| ns | MongoDB Namespace File |
| ns | netCDF Data |
| ns1 | NetStumbler NS1 Log |
| ns2 | Lotus Notes 2 Database |
| ns3 | Lotus Notes 3 Database |
| ns4 | Lotus Notes 4 Database |
| ns5 | Lotus Notes 5 Database |
| nsa | AceBackup Archive File |
| nsb | AceBackup Backup File |
| nsbmd | Nintendo DS Model |
| nsbta | Nintendo DS Texture Animation |
| nscr | Nitro Screen Resource |
| 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 | Nessie Saved State |
| nsh | Lotus Notes NSH Database |
| nsi | BLAST NSI Data |
