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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .N2E | NeocoreGames | Game Files | The Incredible Adventures Of Van Helsing Effects | The Incredible Adventures of Van Helsing | NeocoreGames |
| .N2PK | NeocoreGames | Game Files | The Incredible Adventures Of Van Helsing Game Data File | The Incredible Adventures of Van Helsing | NeocoreGames |
| .N64 | Unknown Developer | Game Files | Nintendo 64 Emulator ROM File | Project64 | Open Source |
| .NAM | Aqua-3D | Game Files | Aqua3D Network File | Aqua3D | Unknown Developer |
| .NAR | Nexon | Game Files | Nexon Game Archive | Counter-Strike Online | Nexon |
| .NARC | Nintendo | Game Files | Nintendo DS Archive File | MKDS Course Modifier | Gericom |
| .NAV | Valve | Game Files | Id Tech 3 Bot Navigation File | Quake 3 Arena | id Software |
| .NAZ | Deadline Games | Game Files | Total Overdose Game Data File | Deadline Games Total Overdose | Deadline Games |
| .NCF | Valve | Game Files | No Cache File | GCFScape | Open Source |
| .NCP | Nikon | Game Files | Nikon Camera Photo Settings | Nikon ViewNX | Nikon |
| .NDS | Nintendo | Game Files | Nintendo DS Game ROM | No Cash GBA (No$GBA) | Martin Korth |
| .NEBULA | Sierra Entertainment | Game Files | Nebula Data | Homeworld 2 | Sierra Entertainment |
| .NES | Nintendo | Game Files | Nintendo (NES) ROM File | Jnes | Jabosoft |
| .NFG | Open Source | Game Files | NewsBin Configuration File | DJI Interprises NewsBin Pro | Open Source |
| .NFO | Microsoft Corporation | Game Files | System Information File | Microsoft System Information | Microsoft Corporation |
| .NFS | Codemasters | Game Files | F1 2015 Speech Data | F1 2015 | Codemasters |
| .NFS13SAVE | Electronic Arts | Game Files | Need For Speed: Most Wanted Saved Game Position | Need For Speed | Electronic Arts |
| .NGB | Alexander S. Meshcheryakov | Game Files | Nonogram Puzzle Data | QNonograms | Alexander S. Meshcheryakov |
| .NGN | Terminal Reality | Game Files | Fly! Engine Specification | Fly! | Terminal Reality |
| .NGP | Richard Bannister | Game Files | Neo Geo Pocket ROM Image | Neopocott v0.5.2 | Richard Bannister |
| .NGS | 5pb. and Nitroplus | Game Files | Steins;Gate Game File | Steins;Gate | 5pb. and Nitroplus |
| .NH | Interscape | Game Files | NetHack Game Configuration File | NetHack | Interscape |
| .NIS | Sierra Entertainment | Game Files | Homeworld Non-Interactive Sequence | Homeworld 2 | Sierra Entertainment |
| .NKM | Native Instruments | Game Files | Kontakt Multi Instrument File | Native Instruments Kontakt | Native Instruments |
| .NLB | Oracle Corporation | Game Files | Oracle Locale Builder Binary File | Oracle Locale Builder | Oracle Corporation |
| .NLTRACK | Mad Data | Game Files | NoLimits Roller Coaster Track File | NoLimits | Mad Data |
| .NML | Native Instruments | Game Files | Traktor Collection File | Traktor | Native Instruments |
| .NMM | Microsoft Corporation | Game Files | Microsoft 3D Movie Maker Recorded Video | 3D Movie Maker | Microsoft Corporation |
| .NOB | Infogrames | Game Files | Silver Game Data | Silver | Infogrames |
| .NON | Totally Games | Game Files | Star Wars: Tie Fighter Mouse Options File | Star Wars: TIE Fighter | LucasArts Entertainment Company, LLC |
| .NPA | 5pb. and Nitroplus | Game Files | Steins;Gate Archive File | Steins;Gate | 5pb. and Nitroplus |
| .NPC | Nikon | Game Files | Picture Control Utility Picture Control File | Picture Control Utility | Nikon |
| .NS1 | Open Source | Game Files | Nestopia Save State | Nestopia | Open Source |
| .NSM | Unknown Developer | Game Files | NESticle Movie | Unknown Software | Unknown Developer |
| .NSS | Perion Network Ltd | Game Files | Magentic Screensaver File | IncrediMail | Perion Network Ltd |
| .NTL | Blizzard Entertainment Inc. | Game Files | Diablo 2 Mod D2NT Script | Diablo II | Blizzard Entertainment Inc. |
| .NTRK | Ubisoft | Game Files | Pacific FIghters Online Track File | Pacific Fighters | Ubisoft Blue Byte |
| .NUT | Open Source | Game Files | NUT Video File | MPlayer | The MPlayer Team |
| .NV | Q.W.Page Associates Inc | Game Files | NewViews Database File | Q.W. Page NewViews 2 | Q.W.Page Associates Inc |
| .NVT | Neuralynx | Game Files | NeuraLynx Video Tracker Data | Video Tracker File Playback | Neuralynx |
| .NWX | LucasArts Entertainment Company, LLC | Game Files | Outlaws Choreography File | Outlaws | LucasArts Entertainment Company, LLC |
| .NX | Nexon | Game Files | MapleStory NX Package | MapleStroy | Nexon |
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