| ndx | Aston-Tate dBASE Database Index |
| 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 |
| nepg | Nord Electro 3 Program |
| nes | NES ROM Image |
| nessus | Nessus Network Security Scanner |
| net | KiCad Netlist Data |
| neta | Netica Binary Data |
| netspm | NetSpot Map |
| 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 |
| nfe | Nikon Capture Fisheye Lens Data |
| nfg | Gambit Strategic Game Format File |
| nfn | NoteFly Note Data |
| nfr | CONTAM Node Flow Results Data |
| nfz | JB BAHN Vehicle Data |
| nga | ngPlant Model Archive |
| ngc | Xilinx Platform Studio Generated Netlist |
| ngd | Xilinx ISE Native Generic Database |
| nge | neXus Personal Security Client Data |
| ngf | NetSight Generated Format Data |
| ngm | Xilinx ISE Map Intermediate Data |
| ngp | NeoGeo Pocket ROM Image |
| ngp | ngPlant Model Data |
| ngrr | Guitar Rig User Presets |