| noy | NOY Backup Data |
| np2 | Nikon Picture Control v2 Data |
| np3 | NP3 Compressed Nucleotide Database |
| npc | Intuit QuickBooks Online Banking Data |
| npg | Magentic Data |
| npk | MikroTik Router OS Upgrade Package |
| npo | Nonpareil Redundancy Summary Output |
| nps | NTI Backup Now Partition Set |
| npw | nPassword Database File |
| npy | NumPy Data File |
| npz | NumPy Zipped Data |
| nqa | NQuery Advisor Data |
| nqi | ESET Smart Security Quarantined File Information |
| nqst | SoundEdit Data |
| nrbak | NeatReceipts Backup Data |
| nrf | Lotus Notes Redirect File |
| nrf | Neat Document Folder File |
| nrm | Lucene Norms File |
| nrmlib | Neat Cabinet File |
| nrrd | Nearly Raw Raster Data |
| nrx | Neat Receipt Folder File |
| ns | netCDF Data |
| ns | MongoDB Namespace File |
| ns1 | NetStumbler NS1 Log |
| ns2 | Lotus Notes 2 Database |
| ns3 | Lotus Notes 3 Database |
| ns4 | Lotus Notes 4 Database |
| nsa | AceBackup Archive File |
| nsb | AceBackup Backup File |
| nsbmd | Nintendo DS Model |
