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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .N64 | Unknown Developer | Game Files | Nintendo 64 Emulator ROM File | Project64 | Open Source |
| .NARC | Nintendo | Game Files | Nintendo DS Archive File | Tahaxan | Open Source |
| .NBM | Oracle Corporation | Plugin Files | NetBeans Module | NetBeans | Open Source |
| .NCF | Valve | Game Files | No Cache File | GCFScape | Open Source |
| .NCX | IDPF (International Digital Publishing Forum) | eBook Files | EPUB Navigation Control XML File | Calibre | Open Source |
| .NDB | Naviter | Data Files | SeeYou Waypoint File | ClamWin | Open Source |
| .NDS | Nintendo | Game Files | Nintendo DS Game ROM | DeSmuME | Open Source |
| .NDZ | Open Source | Disk Image Files | Emulab Frisbee Disk Image | Emulab | Open Source |
| .NES | Nintendo | Game Files | Nintendo (NES) ROM File | FCEUX | Open Source |
| .NFG | Open Source | Settings Files | NewsBin Configuration File | DJI Interprises NewsBin Pro | Open Source |
| .NFO | Microsoft Corporation | System Files | System Information File | AbiWord | Open Source |
| .NGS | 5pb. and Nitroplus | Game Files | Steins;Gate Game File | Embroidermodder 2 | Open Source |
| .NITF | U.S. Department of Defense | Data Files | National Imagery Transmission Format File | GDAL | Open Source |
| .NL | Kdan Mobile Software Ltd | Data Files | Note Ledge File | Natron | Open Source |
| .NLM | Nokia | Raster Image Files | Nokia Logo File | IrfanView | Open Source |
| .NLS | Uri Wilensky | Developer Files | NetLogo Source Code File | Notepad2 | Open Source |
| .NMA | National Marine Electronics Association (NMEA) | Data Files | NMEA Data File | GPSBabel | Open Source |
| .NMV | Open Source | Data Files | Nintendulator Movie Capture File | Nintendulator | Open Source |
| .NNA | NeuralWare | Developer Files | NeuralWare Data | PSPad | Open Source |
| .NOW | The Document Foundation | Text Files | Readme Text Document File | Pico | Open Source |
| .NPL | Nokia | Data Files | Nokia Playlist File | The Core Media Player | Open Source |
| .NPS | Open Source | Settings Files | Natron Node Presets File | Natron | Open Source |
| .NRG | Nero AG | Disk Image Files | Nero CD/DVD Image File | Nrg2Iso | Open Source |
| .NS1 | Open Source | Game Files | Nestopia Save State | Nestopia | Open Source |
| .NSF | Unknown Developer | Audio Files | NES Sound Format File | DeliPlayer | Open Source |
| .NSL | Nullsoft | Developer Files | NsL Script | nsL Assembler for NSIS | Open Source |
| .NTF | Open Source | Font Files | Windows Font File | FontForge | Open Source |
| .NTP | Open Source | Video Files | Natron Project File | Natron | Open Source |
| .NTR | Open Source | Data Files | Netrun Executable List | NetRun | Open Source |
| .NUV | Shedworx | Video Files | NuppelVideo File | MythTV | Open Source |
| .NV | Q.W.Page Associates Inc | Database Files | NewViews Database File | MAME | Open Source |
| .NVM | Open Source | Data Files | PlayStation 2 BIOS Configuration File | PCSX2 | Open Source |
| .NW | GitHub, Inc. | Developer Files | Node-Webkit App Package | NWChem | Open Source |
| .NY | SourceForge | Plugin Files | Audacity Nyquist Plug-in | Audacity | Open Source |
| .NZB | Various Developers | Web Files | NewzBin Usenet Index File | DJI Interprises NewsBin Pro | Open Source |
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