| ndl | Lotus Notes Data Link |
| ndots | Ribbons Polygon Definition |
| ndp | NET Deed Plotter File |
| ndr | Nikon Capture Image Dust Off File |
| nds | Nintendo DS ROM Image |
| ndt | Niton Data Transfer File |
| ndv | Nanodrop Spectrophotometer Report |
| ndx | Aston-Tate dBASE Database Index |
| nec | NEC Antenna Data |
| nef | Nero BackItUp Encryption File |
| nei | LonWorks Neuron EPROM Image File |
| nes | NES ROM Image |
| nessus | Nessus Network Security Scanner |
| net | KiCad Netlist Data |
| neta | Netica Binary Data |
| netspm | NetSpot Map |
| 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 Copy |
| nfc | Nokia Phone Backup |
| nfg | Gambit Strategic Game Format File |
| 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 |
