File extensions start with character 'N'
| File Type | Category | File Format | |
|---|---|---|---|
| .n64 | Image Files | Nintendo 64 Emulator ROM File | |
| .nap | Audio Files | Napster Secured Music File | |
| .nar | Camera Photo Files | Nokia Smart Cam File | |
| .narc | Game Files | Nintendo DS Archive File | |
| .naz | Game Files | Total Overdose Game Data File | |
| .nbe | Data Files | Nessus Report File | |
| .nbf | Backup Files | Nokia Backup File | |
| .nbh | Windows System Files | ROM Update Utility Image File | |
| .nbk | Data Files | SMART Notebook File | |
| .nbm | Plug-in Files | NetBeans Module | |
| .nbu | Backup Files | Nokia Phone Backup File | |
| .nc | CAD Files | Mastercam Numerical Control File | |
| .ncd | Raster Graphics Files | Nero CoverDesigner File | |
| .ncw | Picture Template Files | Native Compressed Wave File | |
| .ndb | Data Files | ClamAV Extended Signature File | |
| .ndif | Disk Image Files | Apple New Disk Image Format File | |
| .ndk | Data Files | Lotus Notes Design Elements File | |
| .ndl | Multiple Use Files | Lotus Notes Doclink File | |
| .ndoc | Text Files | Naver Word | |
| .nds | Game Files | Nintendo DS Game ROM | |
| .ndx | Data Files | dBASE Index File | |
| .nef | Camera Photo Files | Nikon Electronic Format RAW Image | |
| .nes | Game Files | Nintendo (NES) ROM File | |
| .nessus | Data Files | Nessus Network Security Scanner File | |
| .net | Data Files | netViz Project File | |
| .neta | Data Files | Netica Binary File | |
| .nfi | Disk Image Files | Dreambox Disc Image | |
| .nfl | Data Files | Nokia Flash Lite Package | |
| .nfo | Text Files | Warez Information File | |
| .nitf | Data Files | National Imagery Transmission Format File | |
| .nki | Nikon Cache Files | KONTAKT Instrument File | |
| .nks | Audio Files | Kontakt Monolith Container | |
| .nkx | Audio Files | Kontakt Monolith Container File | |
| .nmbtemplate | Spreadsheet Files | Numbers Spreadsheet Template | |
| .nmind | Data Files | NovaMind Mind Map File | |
| .nmp | Data Files | NewsMaker Project File | |
| .nni | Data Files | ANNI Neural Network Investing File | |
| .nnp | Data Files | ANNI Neural Network Portfolio File | |
| .nomedia | Multiple Use Files | Android No Media File | |
| .not | Data Files | Notation File | |
| .note | Wordperfect Files | Notessimo Composition | |
| .notebook | Data Files | SMART Notebook File | |
| .notes | Text Files | Memento Notes File | |
| .now | Text Files | Readme File | |
| .np | Data Files | Portfolio NetPublish File | |
| .npl | Data Files | Nokia Playlist File | |
| .npr | Data Files | Nuendo Project File | |
| .npt | Data Files | Portfolio NetPublish Template | |
| .nrb | Data Files | Nero CD-ROM Boot Compilation | |
| .nrc | Data Files | Nero Disc Compilation File | |
| .nrd | Data Files | Nero DVD-Video Compilation File | |
| .nrg | Disk Image Files | Nero CD/DVD Image File | |
| .nrl | Data Files | Autonomy Interwoven Link File | |
| .nrm | Data Files | Nero Mixed Mode CD Compilation | |
| .nru | Data Files | Nero UDF CD-ROM Compilation | |
| .nsa | Audio Files | Nullsoft Streaming Audio File | |
| .nsq | Data Files | NScheduler Data File | |
| .nsr | Data Files | Nessus Security Report File | |
| .ntf | Data Files | Lotus Note Template | |
| .ntx | Data Files | Clipper Index File | |
| .nupkg | Development Files | NuGet Package | |
| .nv2 | Data Files | NewViews 2 Database File | |
| .nvdl | Data Files | NVDL Script | |
| .nvl | Data Files | UniChem Results File | |
| .nvram | Data Files | VMware NVRAM File | |
| .nwctxt | Text Files | NoteWorthy Composer Text File | |
| .nwp | Partially Downloaded Files | Magnetic Wallpaper File | |
| .nws | Data Files | Windows Live Mail Newsgroup File |