| nopt | Navicat for Oracle Data Transfer Profile Data |
| not | Adobe InCopy User Dictionary |
| not | MakeMusic Finale Note File |
| not | Zemax Element Drawing Note |
| notx | E-Sword v9 Study Note |
| notz | FiiNote Exported Note |
| nou | Numerical Electromagnetics Code Output |
| nov | Native Instruments Battery Data |
| novs | Novell NetWare Control Center Data |
| 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 |
| npa | ReliaSoft Weibull++ NPA Data |
| 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 |
| npi | Nikon Capture Filter Data |
| npk | MikroTik Router OS Upgrade Package |
| npl | Cubase Library Data |
| 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 |
| npr | Lotus Notes Reporter Data |
| nps | Natron Node Presets Data |
