| nab | Novell Addressbook |
| nac | 3COM Router Firmware |
| nad | Neighbourhood Algorithm Direct Access File |
| naf | NI Traktor Service Activation Return Data |
| nal | Microsoft SMS Network Abstraction Layer Data |
| nal | NimbleGen Array Layout Data |
| nal | ZENworks Network Delivered Application Shortcut |
| nam | Aqua3D Network Data |
| nam | DMAP Names Dictionary Data |
| nam | MODFLOW Name Dataset |
| nan | NanoScope Software Data |
| nanr | Nitro Animation Resource |
| nap | NAPLPS Metafile |
| napj | Navicat Premium Batch Job Data |
| nar | EMC NaviSphere Analyzer Archive |
| nas | Nastran Input File |
| natvis | Visual Studio Natvis Framework Data |
| nav | CART Grove Data |
| nav | CART Navigator Data |
| nav2 | WinAVI DVD Copy Temporary Data |
| navrep | Catia NavRep Data |
| nax | Moxy Portfolio Information Data |
| nb3 | Navicat for MySQL Backup Data |
| nb7 | NovaBACKUP v8 Backup Data |
| nba | Nota Bene Configuration Information |
| nbak | Neat Database Backup |
| nbd | NovaBACKUP Data File |
| nbe | Nessus Discovery Report |
| nbf | Windows Mobile Rom Upgrade File |
| nbfc | Nitro Basic File Character |
