| nox | Wave IRIS NOx Data |
| noy | NOY Backup Data |
| nozskin | WinDS PRO NOZSkin Data |
| np2 | Nikon Picture Control v2 Data |
| np3 | NP3 Compressed Nucleotide Database |
| npbk | NoxPlayer Backup Data |
| npc | Intuit QuickBooks Online Banking Data |
| npg | Magentic Data |
| nph | Xilinx ISE Physical Resources Data |
| npi | Nick-O-Matic Design Factory Data |
| npk | MikroTik Router OS Upgrade Package |
| npl | Dart Pro 98 Noiseprint Info |
| npn | ACDSee Canvas Neon Pen Data |
| npo | Nonpareil Redundancy Summary Output |
| nppe | Navicat for PostgreSQL Exported Table |
| nppj | Navicat for PostgreSQL Batch Job |
| nps | NTI Backup Now Partition Set |
| npsf | eXtendable Wad Editor NPSF Data |
| npt | Dart Pro 98 Noiseprint Archive Import |
| npw | nPassword Database File |
| npy | NumPy Data File |
| 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 |
| nrkt | NI REAKTOR User Presets Data |
| nrm | Lucene Norms File |
