| ngp | NeoGeo Pocket ROM Image |
| ngp | ngPlant Model Data |
| ngrr | Guitar Rig User Presets |
| ngs | NGSSniff Data |
| ngw | NGRAIN 3D Data |
| nhcode | Mastercam NetHASP Code |
| nhd | NetHelpDesk Page Data |
| nhm | Microsoft SMS NHM Data |
| nhx | New Hampshire eXtended Format Data |
| nia | Nikon Capture Image Adjustment Data |
| nick | Microsoft Outlook 2000 Auto Complete Nick List |
| nicrash | NI Traktor Crash Data |
| nid | Nikon Capture IPTC Data |
| nifcache | Gamebryo NIF Cache |
| nii | NIfTI-1 Data Format File |
| nil | Norton Icon Library File |
| nin | BLAST Nucleotide Database |
| niv | theWord New International Version Module |
| nix | IBM Rational XDE Node Instance File |
| nja | Seifert XRD ASCII Pole Figures Data |
| njb | Nikon Photo Index |
| njc | Seifert XRD Pole Figures Data |
| njf | Lotus Notes Job Data |
| nji | Nero BackItUp Job Information |
| njob | NDARC Job Data |
| njt | Nero BackItUp Job Template |
| nk2 | Microsoft Outlook 2002 Auto Complete Nick List |
| nka | NI Abbey Road Drummer Data |
| nkd | Nikon ViewNX Thumbnail Cache |
| nkfn | Kernel for NTFS Data Recovery Snapshot Data |
