| nm3 | Navitel v5 Map |
| nm7 | Navitel Navigator v7 Map |
| nmb | Samba NetBIOS Name Server Log |
| nmbd | Samba NetBIOS Name Server Log |
| nmig | Noah System 3 Database |
| nmig2 | Noah System 3 Database |
| nmm | Nightmare Module |
| nmp | Nikon E-Max Data |
| nmr | NUTS NMR 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 |
| 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 |
| not | Adobe InCopy User Dictionary |
| not | Zemax Element Drawing Note |
| not | MakeMusic Finale Note File |
| notx | E-Sword v9 Study Note |
| notz | FiiNote Exported Note |
| nou | Numerical Electromagnetics Code Output |
| nov | Native Instruments Battery Data |
| np2 | Nikon Picture Control v2 Data |
| np3 | NP3 Compressed Nucleotide Database |
