N
| Ext. | Description | Used by |
|---|---|---|
| NAM | Name Space Modules | Novell NetWare |
| NAP | Naplps file (VideoShow) | EnerGraphics |
| NAPLPS | North American Presentation Layer Protocol Syntax | |
| NB | Text file | Nota Bene |
| NB | Wolfram Mathematica Notebook | Mathematica |
| NBF | Nokia Backup File | Nokia Mobile Phones |
| NC | Binary Data | netCDF software package |
| NC | Instructions for NC (Numerical Control) machine | CAMS |
| NC | Non-error checking preprosessed Goc source code | Geoworks |
| NCC | CNC (Computer Numeric Control) control file | CamView 3D |
| NCD | Norton Change Directory support file | Norton Commander |
| NCP | Re-volt Collision file | Re-volt |
| NDB | Network database | Intellicom - Compex |
| NDS | Nintendo DS ROM file used for Homebrew and commercial (Game) files on DS | Nintendo DS |
| NDL | Nodelist file | |
| NDX | Index file | dBASE II - III - IV - dBFast |
| NEO | Raster graphics file | Atari Neochrome |
| NES | iNES ROM image format | |
| NET | Network configuration/info file | |
| NEU | Pro/Engineer neutral file format | PTC Pro/Engineer |
| netCDF | Network Common Data Format | |
| NEW | New info | |
| NFF | Haines Neutral File Format | |
| NFF | WorldToolKit Neutral File Format | |
| NFO | Folioview database | |
| NFO | Help format | Nextpage Folio |
| NFO | Info file | Compact NFO Viewer |
| NG | Hypertext Database | Norton Guide |
| NGO | NG linker object file | NGML |
| NGS | NG compiler source file | NGC |
| NIF | netimmerse/gamebyro file | |
| NIL | NIL | Icon Hear-It |
| NITF | National Imagery Transmission Format | |
| NK2 | e-mail address autocomplete archive | Microsoft Office Outlook |
| NL | Norton Desktop Icon Library | |
| NLM | Netware loadable module | Novell Netware |
| NLS | National Language Support file | MS-DOS |
| NLX | Form | FormWorx 3.0 |
| nmf | Node Map File | Used by SpicyNodes |
| nnn | Arj archive volumes up to 999 | ARJ |
| nnn | Netware unicode rule table (e.g. 1250_Uni.036) | Novell Netware |
| nnn | News about smth with ext. of ver. number | |
| nnn | RAR archive volumes up to 999 | RAR |
| NOT | Notation | |
| NOT | Yard Notes File | FYM |
| NP | Project schedule (Nokia Planner) | Nokia Planner |
| NPI | Source for DGEN.EXE interpreter | dBASE Application Generator |
| NPJ | Nile Project | Game Mission Editor |
| NRG | Nero Disc Image File | Nero Express / Burning ROM |
| NRW | Nikon Coolpix RAW image | Nikon |
| NSA | media | Nullsoft Streaming Audio |
| NSF | database | Lotus Notes |
| NSF | Music module | NES Sound File |
| NSS | Norton screensaver module | NC - NDW Screen Saver |
| NST | Music module | Amiga Noise Tracker |
| NSV | media | Nullsoft Streaming Video |
| NSX | Compound index file | SuccessWare SIX 3.00 |
| NT | Startup files | Windows NT |
| NT3 | BAHN Layout file | JBSS BAHN |
| NTF | database design template | Lotus Notes |
| NTH | Nokia Theme File | Nokia PC Suite |
| NTR | Executable ASCII text file (strip header and rename) | netrun31.zip |
| NTS | Executable ASCII text file (strip header and rename) | netsend1.zip |
| NTS | Tutorial | Norton |
| NTX | Database index file | Clipper 5 |
| NUF | Message for new users on their 1st call | Procomm Plus |
| NUMBERS | Numbers spreadsheet file | Numbers (Apple iWork '08) |
| NV | NewViews DOS accounting database | QW Page NewViews |
| NV2 | NewViews accounting database | QW Page NewViews |
| NWS | Info text file (latest news) (ASCII) | |
| NXT | Sound (NeXT format) |
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