| npsf | eXtendable Wad Editor NPSF Data |
| npt | Dart Pro 98 Noiseprint Archive Import |
| npt | NetPoint Schedule Data |
| npw | nPassword Database File |
| npy | NumPy Data File |
| npz | GameGuard Update Data |
| npz | NumPy Zipped Data |
| nqa | NQuery Advisor Data |
| nqf | Eset NOD32 Quarantine Data |
| nqi | ESET Smart Security Quarantined File Information |
| nqr | Niviqure ECG Data |
| 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 |
| 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 |
| 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 |
