| N File Extensions |
File types with extensions that start with the letter N.
| Extension | File Type | File Summary |
| .n-gage | Game | N-Gage Application |
| .n3pmesh | Game | Knight Online 3D Mesh File |
| .n64 | Game | Nintendo 64 Emulator ROM File |
| .na2 | Misc | Netscape Address Book File |
| .nap | Vector Image | NAP Metafile |
| .nap | Audio | Napster Secured Music File |
| .narc | Game | Nintendo DS Archive File |
| .nav | Game | Counter-Strike Bot Navigation File |
| .nav | Misc | MSN Application Extension File |
| .nav2 | Misc | WinAVI Temporary Navigation File |
| .naz | Game | Total Overdose Game Data File |
| .nb | Spreadsheet | Mathematica Notebook |
| .nb0 | System | Device Boot Loader Image |
| .nb7 | Backup | NovaBACKUP Output File |
| .nba | Backup | Nero BackItUp Archive |
| .nbf | Backup | Backup Now Archive |
| .nbf | Backup | Nokia Backup File |
| .nbi | Backup | Nero BackItUp Information File |
| .nbk | Backup | NovaBACKUP Backup Script |
| .nbk | Data | SMART Notebook File |
| .nbp | Plugin | NeoBook Plugin File |
| .nbp | Data | Mathematica Player Notebook File |
| .nbu | Backup | Nokia Phone Backup File |
| .nc | CAD | Mastercam Numerical Control File |
| .ncb | Manufacturer | Visual C++ IntelliSense Database |
| .ncd | Raster Image | Nero CoverDesigner File |
| .ncd | Disk Image | NTI CD-Maker Disc Image |
| .ncf | Game | No Cache File |
| .ncfg | Settings | ArcGIS Explorer Configuration File |
| .nch | Misc | Outlook Express Folder File |
| .nco | Backup | Nero BackItUp File |
| .ncor | Video | Adobe Encore Project File |
| .ncr | Raster Image | NCR Image |
| .nct | Raster Image | Nero CoverDesigner Template |
| .ncx | Misc | EPUB Navigation Control XML File |
| .nd | Settings | QuickBooks Network Data File |
| .nd5 | Misc | Renamed NDS File |
| .ndb | Data | ClamAV Extended Signature File |
| .ndc | Settings | Personal Communications Settings File |
| .ndf | Database | SQL Server Secondary Database File |
| .ndif | Data | Nokia Data File |
| .ndif | Disk Image | Apple New Disk Image Format File |
| .ndk | Data | Lotus Notes Design Elements File |
| .nds | Game | Nintendo DS Game ROM |
| .ndx | Data | dBASE Index File |
| .nef | Raster Image | Nikon Electronic Format RAW Image File |
| .neo | Raster Image | NeoChrome Bitmap Image |
| .nes | Game | Nintendo (NES) ROM File |
| .net | Plugin | FileMaker Networking Module |
| .net | Data | netViz Project File |
| .neta | Data | Netica Binary File |
| .neu | CAD | Pro/ENGINEER Neutral File |
| .nfb | Backup | Nokia Phone Backup File |
| .nfc | Backup | Nokia Phone Backup Copy File |
| .nff | 3D Image | Neutral File Format |
| .nfi | Disk Image | Dreambox Disc Image |
| .nfo | Data | Folio Views Infobase File |
| .nfo | Game | Age of Empires Player File |
| .nfo | System | System Information File |
| .nfo | Text | Warez Information File |
| .ngage | Game | N-Gage Game File |
| .nib | Manufacturer | Interface Resources |
| .nick | Misc | Outlook 2000 Nickname File |
| .nif | 3D Image | Gamebryo Model File |
| .nitf | Data | National Imagery Transmission Format File |
| .njb | Misc | Nikon Photo Index File |
| .nji | Settings | Nero Job Information File |
| .nk2 | Misc | Outlook 2002 Nickname File |
| .nki | Audio | KONTAKT Instrument File |
| .nls | System | Microsoft National Language Support File |
| .nltrack | Game | NoLimits Roller Coaster Track File |
| .nmc | GIS | ArcGIS Explorer Map Content File |
| .nmf | GIS | ArcGIS Explorer Map File |
| .nmind | Data | NovaMind Mind Map File |
| .nn | Disk Image | Nero CD File List |
| .nni | Data | ANNI Neural Network Investing File |
| .nnp | Data | ANNI Neural Network Portfolio File |
| .not | Data | Notation File |
| .notebook | Data | SMART Notebook File |
| .notes | Text | Memento Notes File |
| .now | Text | Readme File |
| .np | Data | Portfolio NetPublish File |
| .npl | Data | Nokia Playlist File |
| .npp | Page Layout | Art Explosion Publisher Pro Document |
| .npr | Data | Nuendo Project File |
| .npt | Data | Portfolio NetPublish Template |
| .nqc | Manufacturer | Not Quite C Source Code File |
| .nra | Audio | Nero Audio Compilation |
| .nrc | Data | Nero Disc Compilation File |
| .nrg | Disk Image | Nero CD/DVD Image File |
| .nri | Disk Image | Nero ISO CD Compilation File |
| .nrl | Data | Autonomy Interwoven Link File |
| .nrs | Backup | NovaBACKUP Restore Script |
| .nrt | Audio | Nokia Ringtone |
| .nrw | Raster Image | Nikon Raw Image File |
| .ns2 | Database | Lotus Notes 2 Database |
| .ns3 | Database | Lotus Notes 3 Database |
| .ns4 | Database | Lotus Notes 4 Database |
| .nsa | Audio | Nullsoft Streaming Audio File |
| .nsbca | Game | Nintendo DS Model Animation File |
| .nsbmd | Game | Nintendo DS Model File |
| .nsbtx | Game | Nintendo DS Model Texture File |
| .nsf | Audio | NES Sound Format File |
| .nsf | Database | Lotus Notes Database |
| .nsf | Database | Lotus Domino Database |
| .nsq | Data | NScheduler Data File |
| .nss | Misc | Magnetic Screensaver File |
| .nst | Audio | NoiseTracker Module |
| .nsv | Video | Nullsoft Streaming Video File |
| .nt | System | Windows NT Startup File |
| .ntc | Settings | Camera Control Pro Custom Curves File |
| .ntf | Misc | MediaFACE II CD Label File |
| .nth | Misc | Nokia Series 40 Theme File |
| .ntn | Audio | NOTION Song File |
| .ntrk | Game | Pacific FIghters Online Track File |
| .nts | Settings | Lotus Notes Traveler Server Config File |
| .ntx | Data | Clipper Index File |
| .numbers | Spreadsheet | Numbers Spreadsheet File |
| .nup | Misc | Smart Security Update File |
| .nuv | Video | NuppelVideo File |
| .nv | Game | MAME NVRAM File |
| .nvc | Video | NeroVision Express Project File |
| .nvc | Settings | Nikon Vignette Correction File |
| .nvf | Audio | Creative Labs NVF Audio File |
| .nvl | Data | UniChem Results File |
| .nwc | Audio | NoteWorthy Composer File |
| .nwctxt | Text | NoteWorthy Composer Text File |
| .nwm | Misc | Sony NWM Display Screen File |
| .nwp | Misc | Magnetic Wallpaper File |
| .nwv | Settings | Dragon NaturallySpeaking User Archive |
| .nxc | Manufacturer | NXC Source Code File |
| .nxg | Web | eSite Builder NXG Web Page |
| .ny | Plugin | Nyquist Plug-in |
| .nyf | Database | myBase Database File |
| .nzb | Web | NewzBin Usenet Index File |