| Extension | Description | File Type |
|---|
| n64 | Nintento 64 Emulation ROM Image File | Game Files |
| nav | MSN Application File | System Files |
| nbf | Backup Now Backup File | Backup Files |
| nbh | ROM Update Utility Image File | Disk Image Files |
| nbu | Nokia PC Suite Backup File | Backup Files |
| nc | Mastercam File | CAD Files |
| ncd | Nero CoverDesigner Document File | Graphic Files |
| ncf | Steam Configuration File | Game Files |
| nd5 | NDS Renamed File | Game Files |
| ndif | New Disk Image File | Disk Image Files |
| nds | Nintendo DS ROM Image File | Game Files |
| nef | Electronic Format RAW Image File | Graphic Files |
| nes | Nintendo ROM Image File | Game Files |
| net | netViz Project File | Data Files |
| new | New Information File | Text Files |
| nfo | Information File | Text Files |
| nfs | Network File System Temporary File | Data Files |
| nfs11save | Need For Speed Saved File | Game Files |
| nh | NetHack File | Game Files |
| nib | Adobe AIR File | Web Files |
| nif | Gamebryo Model File | 3D Files |
| njb | Photo Index File | Misc Files |
| nls | National Language Support File | Misc Files |
| nm | Number Magic File | Data Files |
| nm2 | Navitel Navigator Map File | Geographical Files |
| nm3 | Navitel Navigator Map File | Misc Files |
| nm3 | DNMR3 Input File | Misc Files |
| nmdsdcid | nmdsdcid | Settings Files |
| nng | Pioneer Avic File | Misc Files |
| nomedia | Android Nomedia File | Multimedia Files |
| notebook | Smart Notebook File | Misc Files |
| npf | Backup Now Image File | Disk Image Files |
| nra | Audio Compilation File | Audio Files |
| nrg | NRG File Format | Disk Image Files |
| nri | Nero CD Compilation File | Disk Image Files |
| nrw | Nero WMA Compilation File | Misc Files |
| nrw | Nikon RAW File | Graphic Files |
| ns2 | Lotus Notes Database File | Document Files |
| nsi | NSIS Script File | Developer Files |
| nt | Windows NT Install Final | System Files |
| nth | Nokia Theme File | Misc Files |
| ntw | Lode Data Network File | Data Files |
| ntx | Marine Navigation Information File | Geographical Files |
| numbers | iWork Numbers Spreadsheet File | Spreadsheet Files |
| nup | Program Component Update Files | Misc Files |
| nvc | Nero Vision Project File | Multimedia Files |
| nvm | AOLpress Help File | Web Files |
| nwc | NoteWorthy Song File | Audio Files |
| nwc | Autodesk Navisworks Cache File | 3D Files |
| nzb | NewzBin Index File | Web Files |