| nds | Nintendo DS ROM Image |
| ndt | NEPLAN External Program Data |
| ndt | Niton Data Transfer File |
| ndu | SymbianOS Backup Data |
| ndv | Nanodrop Spectrophotometer Report |
| ndv | SmartWare Network Driver |
| ndx | Aston-Tate dBASE Database Index |
| ndx | Concordance Numeric Data and Text Fields Data |
| ndx | Neat 5 Exported Archive |
| nearest | PLINK Nearest Neighbor Distance Report Data |
| neb | Nord Electro 3 Factory Backup |
| nec | NEC Antenna Data |
| ned | Navicat for MySQL ER Diagram Data |
| nef | Nero BackItUp Encryption File |
| nei | LonWorks Neuron EPROM Image File |
| neon | NEON Encoded Data |
| nepg | Nord Electro 3 Program |
| nes | NES ROM Image |
| nessus | Nessus Network Security Scanner |
| net | KiCad Netlist Data |
| net | PTV VISUM Network Data |
| neta | Netica Binary Data |
| netspm | NetSpot Map |
| neu | Altair FEKO Femap Geometrical Data |
| nev | NeuraLynx Event Information Data |
| newsloc | Mac OS X Finder News Location Data |
| nex | NeuroExplorer Data |
| nex | NEXUS Data File |
| nf | The Bro NetFlow Data |
| nf2 | NeverForget v2 Data |
| nfa | Netflix for Android Data |
| nfb | Nokia Phone Backup |
| nfc | Nokia Phone Backup |
| nfd | Altair FEKO Near Field Data Input |
| nfd_data | Nero Multimedia Suite Data |
