| nrg | WaterGEMS Energy Calculations Results Data |
| nrkt | NI REAKTOR User Presets Data |
| nrl | iManage Data |
| nrm | Lucene Norms File |
| nrmlib | Neat Cabinet File |
| nrp | ASP.NET Report Maker Report |
| nrrd | Nearly Raw Raster Data |
| nrs | NovaBACKUP Restore Script |
| nrsv | theWord New Revised Standard Version Bible Module |
| 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 | Nestopia Saved State 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 |
| nsce | NeoEngine Scene Data |
| nscr | Nitro Screen Resource |
| nsd | Autodesk Simulation Mechanical Nodal Stress Results Data |
| nsd | BLAST Nucleotide Database |
| nsd | NRG Systems Symphonie Data |
| nse | NeuraLynx Single Electrode Waveform Data |
