| nm | RM Number Magic Document |
| nm2 | Navitel v3 Map |
| nm3 | Navitel v5 Map |
| nm7 | Navitel Navigator v7 Map |
| nmb | Samba NetBIOS Name Server Log |
| nmbd | Samba NetBIOS Name Server Log |
| nmdb | NoiseMap Database |
| nmf | Lightwave 3D Normal Map |
| nmi | SwordSearcher Data |
| nmig | Noah System 3 Database |
| nmig2 | Noah System 3 Database |
| nml | News Markup Language Data |
| nmm | Nightmare Module |
| nmmm | Samsung Note Data |
| nmo | 3DVIA Virtools Behavioral Object |
| nmp | Nikon E-Max Data |
| nmpd | Navicat for MariaDB Data Synchronization Data |
| nmpj | Navicat for MariaDB Batch Job |
| nmps | Navicat for MariaDB Structure Synchronization Data |
| nmpt | Navicat for MariaDB Transfer Data |
| nmr | NUTS NMR Data |
| nms | 3DVIA Virtools Graphical Script |
| nmu | Debian Non-maintainer Upload |
| nmu | EMC Documentum Client Library Query Cache |
| nmx | NI Traktor Mix Data |
| nna | NeuralWare NeuralWorks Data |
| nnb | ANNI Neural Network Batch |
| nnd | CYMFLOW Network Data |
| nnf | Cytoscape Nested Network Format File |
| nni | ANNI Neural Network Investing |
