| Abbreviation | Definition |
|---|---|
| NIF | Hardware Network Initialization File |
| NIF | Navy Interchange File Format Bitmap graphics |
| NIFF | Navy Interchange File Format Bitmap graphics |
| NITF | National Imagery Transmission Format |
| NL | Norton Desktop Icon Library |
| NLM | Netware loadable module (Novell Netware) |
| NLX | FormWorx 3.0 Form file |
| NOD | No Obvious Direction |
| NOT | Notation or note |
| NOTE | Help document (WordPerfect for Mac) |
| NOW | Usually README file |
| NP | Project schedule (Nokia Planner) (Visual Planner 3.x) |
| NPI | Source for DGEN.EXE interpreter (dBASE Application Generator) |
| NRF | Bitmap graphics (Neutral Raster File) |
| NRF | Neutral Raster File (Bitmap graphics) |
| NRF | Nova Resource File |
| NS2 | Data (Lotus Notes) |
| NS3 | Data (Lotus Notes) |
| NSF | Lotus Notes Data |
| NSF | NES Sound Format |