| nmi | SwordSearcher Data |
| nmig | Noah System 3 Database |
| nmig2 | Noah System 3 Database |
| nmm | Nightmare Module |
| nmo | 3DVIA Virtools Behavioral Object |
| nmp | Nikon E-Max Data |
| nmpj | Navicat for MariaDB Batch Job |
| nmps | Navicat for MariaDB Structure Synchronization Data |
| nmpt | Navicat for MariaDB Transfer Data |
| nmr | NUTS NMR Data |
| 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 |
| 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 |
| nntp | NewsWatcher NNTP Data |
| nnvs | NextNine VNC Player Session Data |
| nnw | NobleNet Web Data |
| nob | Chart Navigator Pro Navigation Objects Data |
| nod | MSC Patran Nodal Results |
| nodes | PowerFolder Nodes Data |
| nog | BLAST NOG Data |
| nom | PC-DMIS NOM File |
| nop | Nikon Optional Picture Control |
| nopd | Navicat for Oracle Data Synchronization Profile Data |
| nope | Navicat for Oracle Exported Table |
| nopem | Navicat for Oracle Export Materialized View Profile |