| 41. | .nif | Binary hardware network initialisation file ◊ Bitmap graphics (Navy Interchange File Format) |
| 42. | .niff | Bitmap graphics (Navy Interchange File Format) |
| 43. | .nil | Icon Library (EasyIcons-compatible) (Norton) |
| 44. | .nist | Sound (NIST Sphere audio) |
| 45. | .nit | INFO table definitions file (ArcView) |
| 46. | .nitf | Graphics (National Image Transmission Format) |
| 47. | .nl | Norton Desktop Icon Library |
| 48. | .nlb | Data (Oracle 7) |
| 49. | .nlm | Netware loadable module (Novell Netware) ◊ Nokia Logo File |
| 50. | .nls | Codepage language files (ArcView) ◊ NASP32 file ◊ National Language Support file for data localization (Uniscape) ◊ Natural Languages Services driver ◊ NetLert file |
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