| Extension | 描述 | 檔案格式 |
|---|
| n64 | Nintento 64 Emulation ROM Image File | 遊戲檔案 |
| nav | MSN Application File | 系統檔案 |
| nbf | Backup Now Backup File | 備份檔案 |
| nbh | ROM Update Utility Image File | 磁碟映像檔 |
| nbu | Nokia PC Suite Backup File | 備份檔案 |
| nc | Mastercam File | CAD Files |
| ncd | Nero CoverDesigner Document File | 圖檔 |
| ncf | Steam Configuration File | 遊戲檔案 |
| nd5 | NDS Renamed File | 遊戲檔案 |
| ndif | New Disk Image File | 磁碟映像檔 |
| nds | Nintendo DS ROM Image File | 遊戲檔案 |
| nef | Electronic Format RAW Image File | 圖檔 |
| nes | Nintendo ROM Image File | 遊戲檔案 |
| net | netViz Project File | 資料檔 |
| new | New Information File | 文字檔 |
| nfo | Information File | 文字檔 |
| nfs | Network File System Temporary File | 資料檔 |
| nfs11save | Need For Speed Saved File | 遊戲檔案 |
| nh | NetHack File | 遊戲檔案 |
| nib | Adobe AIR File | 網頁檔案 |
| nif | Gamebryo Model File | 3D Files |
| njb | Photo Index File | Misc Files |
| nls | National Language Support File | Misc Files |
| nm | Number Magic File | 資料檔 |
| nm2 | Navitel Navigator Map File | Geographical Files |
| nm3 | Navitel Navigator Map File | Misc Files |
| nm3 | DNMR3 Input File | Misc Files |
| nmdsdcid | nmdsdcid | 設定檔 |
| nng | Pioneer Avic File | Misc Files |
| nomedia | Android Nomedia File | 多媒體檔案 |
| notebook | Smart Notebook File | Misc Files |
| npf | Backup Now Image File | 磁碟映像檔 |
| nra | Audio Compilation File | 聲音檔案 |
| nrg | NRG File Format | 磁碟映像檔 |
| nri | Nero CD Compilation File | 磁碟映像檔 |
| nrw | Nero WMA Compilation File | Misc Files |
| nrw | Nikon RAW File | 圖檔 |
| ns2 | Lotus Notes Database File | 文件檔案 |
| nsi | NSIS Script File | Developer Files |
| nt | Windows NT Install Final | 系統檔案 |
| nth | Nokia Theme File | Misc Files |
| ntw | Lode Data Network File | 資料檔 |
| ntx | Marine Navigation Information File | Geographical Files |
| numbers | iWork Numbers Spreadsheet File | 試算表檔案 |
| nup | Program Component Update Files | Misc Files |
| nvc | Nero Vision Project File | 多媒體檔案 |
| nvm | AOLpress Help File | 網頁檔案 |
| nwc | NoteWorthy Song File | 聲音檔案 |
| nwc | Autodesk Navisworks Cache File | 3D Files |
| nzb | NewzBin Index File | 網頁檔案 |