| nmig2 | Noah System 3 Database |
| nmm | Nightmare Module |
| nmo | 3DVIA Virtools Behavioral Object |
| nmp | Nikon E-Max Data |
| nmpt | Navicat for MariaDB Transfer Data |
| nmr | NUTS NMR Data |
| nmx | NI Traktor Mix Data |
| nnd | CYMFLOW Network Data |
| nnf | Cytoscape Nested Network Format File |
| nni | ANNI Neural Network Investing |
| nnl | Network Notepad Professional License |
| nnn | Filmetrics F20 Material Data |
| nnp | ANNI Neural Network Portfolio |
| nnr | NeuralWare NeuralWorks Data |
| nns | NobleNet Sealer File |
| nnt | Eudora Addressbook Database |
| nob | Chart Navigator Pro Navigation Objects Data |
| nod | MSC Patran Nodal Results |
| nom | PC-DMIS NOM File |
| nop | Nikon Optional Picture Control |
| nopd | Navicat for Oracle Data Synchronization Profile Data |
| nops | Navicat for Oracle Structure Synchronization Data |
| not | MakeMusic Finale Note File |
| not | Adobe InCopy User Dictionary |
| 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 |
| nox | Wave IRIS NOx Data |
