| File extension | Developer/Producer | File description |
|---|---|---|
| N file extension | Nicolas Cannasse | Neko Bytecode Format |
| N-GAGE file extension | Nokia | Nokia N-Gage Application Format |
| N2 file extension | Nitrous | Nitrous Minecraft GLSL Shader Format |
| N2KM file extension | zsword | Headshape Modding 3D Tool For 3D Studio Max Modding |
| N3D file extension | Nuclear Glory | Nuclear Studio 3D Model Format |
| N3PMESH file extension | K2 Network | Knight Online 3D Mesh Format |
| N64 file extension | N/A | Nintendo 64 Emulation ROM Image Format |
| N81 file extension | Apple, Inc. | Apple IOS Kernel Cache |
| N88 file extension | Apple, Inc. | Apple IOS Kernel Cache |
| N90 file extension | Apple, Inc. | Apple IOS Kernel Cache |
| N90AP file extension | Apple, Inc. | IPhone Jailbreak Firmware |
| N92 file extension | Apple, Inc. | Apple IOS Firmware |
| NA2 file extension | Mozilla | Seamonkey Address Book Format |
| NAB file extension | AOL Inc. | Netscape Communicator Addressbook |
| NACL file extension | Sig Software | NameCleaner |
| NAF file extension | Native Instruments, Inc. | TRAKTOR Service |
| NAL file extension | Microsoft Corporation | System Management Server Network Abstraction Layer |
| NAM file extension | U.S. Geological Survey | MODFLOW Name Format |
| NAP file extension | Napster | Napster Music Security Definition Format |
| NAPR file extension | Sig Software | NameCleaner Preference |
| NARC file extension | Nintendo | Nintendo DS Archive Format |
| NARRATIVE file extension | Mariner Software, Inc. | Mariner Software Narrator Audio Document |
| NAS file extension | N/A | Nasal Script |
| NAV file extension | Valve | Counter-Strike Source CBot Navigation Mesh Format |
| NAV2 file extension | ZJMedia | WinAVI Temporary Navigation Format |
| NAVMAP file extension | Esri | ESRI Data |
| NAZ file extension | Deadline Games | Total Overdose Game Data Format |
| NB file extension | Wolfram Research | Mathematica Notebook Format |
| NB0 file extension | N/A | Microsoft Device Emulator Operating System Image Format |
| NB2 file extension | DJI Interprises, LLC | Newsbin Unfinished Download |
| NB7 file extension | N/A | NovaBACKUP Output Data Backup Format |
| NBA file extension | Nero | Nero BackItUp Archive Format |
| NBAK file extension | The Neat Company | Neat Backup |
| NBC file extension | NBC | Next Byte Codes Source Code Format |
| NBD file extension | NovaStor | PC Backup Pro Backup Format |
| NBE file extension | Tenable Network Security | Nessus Scan Result Format |
| NBF file extension | NewTech Infosystems | Backup NOW! Backup Archive Format |
| NBFC file extension | N/A | Nintendo DS Nitro Basic File Character |
| NBFP file extension | N/A | Nintedo DS Nitro Basic File Palette |
| NBFS file extension | N/A | Nintendo DS Nitro Basic File Screen |
| NBH file extension | N/A | HTC ROM Update Utility ROM Image Format |
| NBI file extension | Nero | Nero BackItUp Backup Format |
| NBIN file extension | Tenable Network Security | Compiled NASL Script |
| NBK file extension | SMART Technologies | NovaBACKUP Script Format |
| NBL file extension | Sega Corporation | Phantasy Star Universe |
| NBM file extension | Oracle | NetBeans Module Format |
| NBP file extension | Wolfram Research | Mathematica Notebook Format |
| NBR file extension | Novawave, inc | Saved Benchmark Result |
| NBS file extension | David Norgren | Minecraft Note Block Studio Format |
| NBT file extension | Mojang | Minecraft Named Binary Tag Format |
| NBU file extension | Nokia | Nokia PC Suite 6.82+ Backup Format |
| NBZ file extension | ArcSoft, Inc. | ArcSoft Total Media Backup & Record Backup |
| NC file extension | CNC Software | Mastercam NC Program Format |
| NC1 file extension | N/A | Xsteel CAD |
| NC2 file extension | newsleecher.com | NewsLeecher Cache |
| NC? file extension | Trend Media Corporation Limited | FlashGet Download Manager Incomplete Download |
| NCA file extension | Nikon Corporation | Nikon Capture Color Adjustment |
| NCB file extension | Microsoft | Microsoft Developer Studio Non-compiled Browse Format |
| NCC file extension | N/A | CNC (Computer Numeric Control) Control File (CamView 3D) |
| NCD file extension | Nero | Nero CoverDesigner Image Format |
| NCER file extension | N/A | Nintendo DS Nitro Cell Resource |
| NCF file extension | Valve | Steam Client Game Configuration Format |
| NCFG file extension | ESRI | ArcGIS Explorer Configuration Format |
| NCGR file extension | Nintendo | Nintendo DS Title Graphics Format |
| NCH file extension | Microsoft | Microsoft Outlook Express Email Tree |
| NCI file extension | CNC Software, Inc. | Mastercam Toolpath |
| NCLK file extension | N/A | HTML Formatted Text |
| NCLR file extension | Nintendo | Nintendo DS Color Palette Format |
| NCO file extension | Nero | Nero BackItUp Compressed Backup Format |
| NCOMP file extension | Richard Hughey - Kevin Karplus - Anders Krogh | SAM Dirichlet Mixture Prior Library |
| NCOR file extension | Adobe Systems | Adobe Encore Project Format |
| NCORX file extension | Adobe Systems | Adobe Encore Project Format |
| NCP file extension | EA Sports | NHL Ice Hockey 2002 User NHLcards |
| NCR file extension | N/A | NCR Image Image Format |
| NCS file extension | BioWare | Bioware Aurora / Obsidian Electron Compiled Script |
| NCSS file extension | NCSS | NCSS Data |
| NCT file extension | Nero | CoverDesigner Template |
| NCV file extension | Nikon Corporation | Nikon Capture Curves |
| NCW file extension | Nero | Nero CoverDesigner Picture Template Format |
| NCX file extension | IDPF | Navigation Control File For XML |
| NCZ file extension | Netcad | Netcad Drawing |
| ND file extension | Intuit | QuickBooks Network Data Format |
| ND5 file extension | N/A | Nintendo DS Game ROM Format |
| NDA file extension | Nero AG | Nero BackItUp Drive Image |
| NDB file extension | Sourcefire | ClamAV Extended Signature Format |
| NDC file extension | IBM | IBM Personal Communications Settings Format |
| NDD file extension | Nikon Corporation | Nikon Capture Digital DEE |
| NDF file extension | Microsoft | Microsoft SQL Server Secondary Data Format |
| NDIF file extension | Nokia | Nokia Data Format |
| NDK file extension | IBM | Lotus Notes Database Design Elements |
| NDL file extension | IBM | Lotus Notes Data Format |
| NDM file extension | Activision | Enemy Territory Quake Wars Demo |
| NDO file extension | IZware LLC | Nendo |
| NDOC file extension | NHN | Naver Word |
| NDOTS file extension | M.Carson | Ribbons Ndots |
| NDP file extension | Brøderbund Software, Inc. | Nick-O-Matic Design Factory Project |
| NDR file extension | Open Text Corporation | RightFax Executable |
| NDS file extension | N/A | Nintendo DS Game ROM Image Format |
| NDT file extension | NEPLAN | NEPLAN External Program Import Or Export |
| NDU file extension | N/A | Symbian Phone Backup |
| NDV file extension | Exelis Visual Information Solutions | ENVI N-D Visualizer State |
| NDW file extension | Nemetschek AG | Allplan Drawing |
| NDX file extension | N/A | DBase Index Format |
| NE0 file extension | NetBSD Foundation, Inc. | NetBSD Config |
| NE1 file extension | OM2 Technology Inc. | OM2 OMALI NENA Version 1 Document |
| NE3 file extension | OM2 Technology Inc. | OM2 OMALI NENA Document |
| NED file extension | OMNeT++ Community | OMNet++ Network Description Format |
| NEF file extension | Nikon | Nikon Digital SLR Camera RAW Image Format |
| NEKO file extension | Nicolas Cannasse | Neko Source Code Format |
| NEN file extension | Brøderbund Software, Inc. | Nick-O-Matic Design Factory Project |
| NEO file extension | Atari | Atari NeoChrome Bitmap Image |
| NEOSAVE file extension | Neopets, Inc. | Neopets Puzzle Adventure Saved Game |
| NEPPRJ file extension | NEPLAN | NEPLAN Project |
| NES file extension | N/A | Nintendo Entertainment System ROM Image |
| NESSUS file extension | Tenable Network Security | Nessus Network Security Scanner Format |
| NET file extension | netViz | NetViz Project Format |
| NETA file extension | N/A | Netica Bayesian Network Binary Format |
| NETBOOT file extension | The Open Group | Unix Netboot Script |
| NETKIT file extension | The GNOME Project | Gnome Desktop |
| NETRC file extension | IBM | .netrc TCP/IP Settings |
| NETSH file extension | Microsoft Corporation | Netsh File Extension |
| NETSPD file extension | NetSpot Team. Etwok | NetSpot Survey Project Format |
| NETSPM file extension | NetSpot Team. Etwok | NetSpot Map Format |
| NETWORKCONNECT file extension | Apple | Apple Network Connect Document |
| NEU file extension | Parametric Technology | Pro/Engineer Neutral Format |
| NEULICENSE file extension | Elegant Chaos | Neu License |
| NEW file extension | N/A | Ameco Embroidery Format |
| NEWSLOC file extension | Apple, Inc. | Apple Mac OS X Finder News Internet Location |
| NEX file extension | N/A | Neuroexplorer Neurological Data |
| NEXE file extension | Google Chrome Native Client Executable Format | |
| NEZ file extension | N/A | NES ROM Emulator Image |
| NFB file extension | Nokia | Nokia PC Suite Phone Backup Format |
| NFC file extension | Nokia | Nokia PC Suite Phone Backup Format |
| NFF file extension | Autodesk | Haines Neutral File Format |
| NFG file extension | DJI Interprises, LLC | NewsBin Configuration |
| NFI file extension | Dream Multimedia | Dreambox Disc Image Format |
| NFL file extension | Nokia | Nokia Flash Lite Package |
| NFM file extension | Embarcadero Technologies | Delphi .NET Form Format |
| NFO file extension | Microsoft | Information Readme Text Format |
| NFP file extension | N/A | Archive |
| NFS file extension | N/A | Network Format System Temporary Format |
| NFS11SAVE file extension | Electronic Arts | Need For Speed: Hot Pursuit 2010 Configuration Format |
| NFS13SAVE file extension | Electronic Arts, Inc. | Need For Speed: Most Wanted Saved Game |
| NFT file extension | NetObjects Inc. | NetObjects Fusion System |
| NFTR file extension | N/A | Nintendo DS Font Type Format |
| NFX file extension | NetObjects Inc. | NetObjects Fusion Components Bbscomp |
| NGAGE file extension | Nokia | Nokia N-Gage Game Format |
| NGC file extension | Xilinx | Xilinx Integrated Software Environment Generated Format |
| NGD file extension | Xilinx | Xilinx Integrated Software Environment Format |
| NGG file extension | N/A | Nokia Group Graphics Image Format |
| NGH file extension | JoWooD Entertainment AG | Neighbours From Hell 2 Saved Game |
| NGLOSS file extension | Nisus Software, Inc. | Nisus Writer Pro Glossary |
| NGN file extension | Terminal Reality | Fly! Engine Specification |
| NGO file extension | Brøderbund Software, Inc. | Nick-O-Matic Design Factory Project |
| NGP file extension | N/A | Neo Geo Pocket ROM Image Format |
| NGR file extension | NEPLAN | NEPLAN Graphic Data |
| NGRR file extension | Native Instruments, Inc. | GUITAR RIG Sound |
| NGS file extension | Next Generation Security Software Ltd (NGS) | NGSSniff |
| NGT file extension | Noni GPSPlot | NONI GPSPlot GIS Format |
| NH file extension | Stichting Mathematisch Centrum | NetHack Defaults |
| NHA file extension | HIMSA | Native Noah Format |
| NHB file extension | Anders Petersson | No Hands Backup Backup Description |
| NHD file extension | Nero AG | Nero AVHCD DVD Compilation |
| NHF file extension | Nero AG | Nero HFS-CD Compilation |
| NHL file extension | EA Sports | Nhl Ice Hockey Game 2002 User Teams |
| NHN file extension | ijji Games LLC | Ijji REACTOR Html Launch |
| NHP file extension | N/A | NOAA Hydrophone Data |
| NHS file extension | NHibernate Developers | NHibernate |
| NHV file extension | Nero AG | Nero HD-BURN-Video Compilation |
| NI file extension | NetObjects Inc. | NetObjects Fusion Preview |
| NIA file extension | Nikon Corporation | Nikon Capture Image Adjustment |
| NIB file extension | N/A | Interface Builder User Interface Resources |
| NICK file extension | Microsoft | Microsoft Outlook Nickname Format |
| NICNT file extension | Native Instruments, Inc. | Native Instruments KONTAKT Library |
| NICRASH file extension | Native Instruments, Inc. | TRAKTOR Crash Report |
| NID file extension | Nikon Corporation | Nikon Capture IPTC Data |
| NIF file extension | Emergent Game Technologies | GameBryo Format |
| NIFF file extension | N/A | NIFF Navy Image File Format |
| NIL file extension | Symantec Corporation | Norton Icon Library |
| NIM file extension | Nimrod Software Foundation | Nimrod Source Code Format |
| NIP file extension | Microsoft Corporation | Microsoft DRM (Digital Right Management) |
| NIST file extension | N/A | Audio |
| NIT file extension | Esri | ArcView INFO Table Definitions |
| NITF file extension | N/A | National Imagery Transmission Format |
| NIX file extension | IBM | Rational XDE |
| NJB file extension | Nikon | Nikon Digital SLR Camera Image Index Format |
| NJF file extension | N/A | IBM Lotus Domino |
| NJI file extension | Nero | Nero BackItUp Job Format |
| NJT file extension | Nero AG | Nero BackItUp Job Template |
| NJX file extension | NJStar Software | NJStar Document Format |
| NK file extension | The Foundry | NUKE Script Format |
| NK2 file extension | Microsoft | Microsoft Outlook Contacts AutoComplete Format |
| NKB file extension | Native Instruments | Kontakt Audio Bank |
| NKC file extension | Native Instruments | Native Instruments KONTAKT Library Data Format |
| NKD file extension | Nikon Corporation | Nikon ViewNX Thumbnail Cache |
| NKI file extension | Native Instruments | Native Instruments Instruments Sample Format |
| NKM file extension | Native Instruments | Native Instruments KONTAKT Format |
| NKP file extension | Native Instruments | Kontakt Saved Presets |
| NKR file extension | Native Instruments, Inc. | KONTAKT Resource Container |
| NKS file extension | Native Instruments | Native Instruments Archive Format |
| NKX file extension | Native Instruments | Native Instruments Monolith Format |
| NL file extension | Symantec Corporation | Norton Desktop Icon Library |
| NL2 file extension | eSignal | ESignal Market Depth |
| NLANG3 file extension | Ashampoo GmbH & Co. KG | Ashampoo Internet Accelerator Language |
| NLB file extension | Codemasters | Colin McRae Rally Network Leader Boards Game |
| NLC file extension | Nero AG | Nero Linux Compilation |
| NLELEM file extension | Mad Data | NoLimits Rollercoaster Simulation Track Element Format |
| NLG file extension | Martin Freij | Nestopia Language |
| NLK file extension | N/A | Outlook 2003 E-mail Cookie |
| NLM file extension | Nokia | Nokia Logo File Image Format |
| NLOGO file extension | NetLogo | NetLogo Model Format |
| NLOGO3D file extension | NetLogo | NetLogo 3D Model Format |
| NLPD file extension | PremiumSoft CyberTech Ltd. | Navicat For SQLite Data Synchronization Profile |
| NLPE file extension | PremiumSoft CyberTech Ltd. | Navicat For SQLite Exported Table |
| NLPEQ file extension | PremiumSoft CyberTech Ltd. | Navicat For SQLite Export Query Result Profile |
| NLPEV file extension | PremiumSoft CyberTech Ltd. | Navicat Export View Result Profile |
| NLPI file extension | PremiumSoft CyberTech Ltd. | Navicat For SQLite Import Wizard Profile |
| NLPT file extension | PremiumSoft CyberTech Ltd. | Navicat For SQLite Data Transfer Profile |
| NLPX file extension | Mad Data | Mad Data NoLimits Game Data Format |
| NLR file extension | N/A | NLREG Nonlinear Regression Control |
| NLS file extension | Microsoft | Microsoft National Language Support Format |
| NLTRACK file extension | Mad Data | NoLimits Roller Coaster Track Format |
| NLV file extension | Nikon Corporation | Nikon Capture LCHE Editor |
| NM file extension | Space Engine | Space Engine Nebula Model Format |
| NM2 file extension | Navitel | Navitel Navigator Map Format |
| NM3 file extension | Navitel | Navitel Navigator 5.0 Map Format |
| NM5 file extension | Nova Mind Software Pty Ltd. | NovaMind Mind Map |
| NM7 file extension | GPS Moldova | Navitel Navigator Map |
| NMAP file extension | NaviComputer | NaviComputer Map Format |
| NMBD file extension | The Samba Team | Samba Log |
| NMBTEMPLATE file extension | Apple | Apple Numbers Spreadsheet Template Format |
| NMC file extension | ESRI | ArcGIS Explorer Map Content Format |
| NMD file extension | Nero AG | Nero MiniDVD Compilation |
| NMF file extension | ESRI | ArcGIS Explorer Map Format |
| NMI file extension | StudyLamp Software LLC | SwordSearcher |
| NMIND file extension | NovaMind | NovaMind Mind Map Format |
| NMK file extension | Microsoft Corporation | Microsoft Program Maintenance Utility Make |
| NML file extension | Native Instruments | Traktor Collection Format |
| NMM file extension | Microsoft Corporation | Microsoft 3D Movie Maker Video |
| NMO file extension | Dassault Systèmes S.A. | Virtools Behavioral Objects |
| NMP file extension | EyePower Games | NewsMaker Project Format |
| NMR file extension | Acorn NMR Inc. | WxNUTS Histogram |
| NMS file extension | NuMega | Numega SoftICE Loader File Including Debugging Info |
| NMSV file extension | Native Instruments, Inc. | Native Instruments MASSIVE Audio |
| NMU file extension | EMC Corporation | EMC Documentum Client Library Query Cache |
| NMV file extension | Quietust | Nintendulator Movie Capture |
| NMW file extension | Microsoft Corporation | Microsoft NetMeeting T126_Whiteboard |
| NN file extension | Nero | Nero CD List Format |
| NNI file extension | Neural Science | ANNI Neural Network Investing Format |
| NNP file extension | Neural Science | ANNI Neural Network Portfolio Format |
| NNR file extension | Nikon Corporation | Nikon Capture Noise Reduction |
| NNTP file extension | Simon Fraser | NewsWatcher |
| NNVS file extension | NextNine Ltd. | NextNine VNC Player VNC Session |
| NNW file extension | NeuralWare | NeuralWare NeuralWorks |
| NOB file extension | N/A | Silver Game Data |
| NOD file extension | NetObjects | NetObjects Fusion Nodes Format |
| NODES file extension | PowerFolder | PowerFolder Nodes |
| NOF file extension | NetObjects Inc. | NetObject Fusion 5.0 |
| NOINDEX file extension | Apple, Inc. | Mac OS X Spotlight Index |
| NOKIA file extension | Nokia Corporation | Nokia Proprietary Ringtone Format |
| NOKOGIRI file extension | Nokogiri Team | Nokogiri Source |
| NOKTXT file extension | N/A | Nokia Proprietary Ringtone Text Format |
| NOL file extension | N/A | Nokia Operator Logo Image Format |
| NOMEDIA file extension | N/A | Google Android OS System Format |
| NON file extension | LucasArts Entertainment Company, LLC | Star Wars: Tie Fighter Mouse Options |
| NOP file extension | Nokia Corporation | Nokia Smart Shoot RAW Photo |
| NOPD file extension | PremiumSoft CyberTech Ltd. | Navicat For Oracle Data Synchronization Profile |
| NOPE file extension | PremiumSoft CyberTech Ltd. | Navicat For Oracle Exported Table |
| NOPEM file extension | PremiumSoft CyberTech Ltd. | Navicat For Oracle Export Materialized View Profile |
| NOPEQ file extension | PremiumSoft CyberTech Ltd. | Navicat For Oracle Export Query Result Profile |
| NOPEV file extension | PremiumSoft CyberTech Ltd. | Navicat For Oracle Export View Result Profile |
| NOPI file extension | PremiumSoft CyberTech Ltd. | Navicat For Oracle Import Wizard Profile |
| NOPT file extension | PremiumSoft CyberTech Ltd. | Navicat For Oracle Data Transfer Profile |
| NOR file extension | N/A | Norwegian Localization |
| NOS file extension | N/A | JDOS System |
| NOT file extension | Notation Software | Notation Or Note Format |
| NOTE file extension | Failsafe Games | Notessimo Song Format |
| NOTEBOOK file extension | SMART Technologies | SMART Notebook Format |
| NOTES file extension | Guys with Towels | Memento Note Format |
| NOTX file extension | Rick Meyers | E-Sword Study |
| NOT_TERMINATED file extension | Apple, Inc. | Mac OS X Audit Log |
| NOV file extension | Native Instruments, Inc. | NI Battery Cache |
| NOVS file extension | Novell, Inc. | Novell NetWare Control Center |
| NOX file extension | Ricardo plc. | Wave IRIS NOx |
| NP file extension | N/A | Portfolio NetPublish Web Template Format |
| NPA file extension | ReliaSoft Corporation | ReliaSoft Weibull++ |
| NPB file extension | PremiumSoft CyberTech Ltd. | Navicat For MySQL Backup Profile |
| NPC file extension | Intuit Inc. | QuickBooks Online Banking |
| NPD file extension | N/A | Netrosoft Presentation Document |
| NPDT file extension | N/A | Mac Text |
| NPE file extension | NVIDIA Corporation | NVIDIA Ntune Overclock System Performance Manager Profile Settings |
| NPEQ file extension | PremiumSoft CyberTech Ltd. | Navicat For MySQL Export Query Result Profile |
| NPEV file extension | PremiumSoft CyberTech Ltd. | Navicat For MySQL Export View Result Profile |
| NPF file extension | NTI | NTI Backup Format |
| NPFX file extension | Symantec | Norton Internet Security Settings Format |
| NPG file extension | Perion Network Ltd. | Magentic Download |
| NPI file extension | dataBased Intelligence, Inc. | DBASE Application Generator Source |
| NPJ file extension | NovaLogic, Inc. | Nova Logic Game Mission |
| NPK file extension | n-Track | N-Track Studio Peak |
| NPL file extension | Nokia | Nokia Audio Format |
| NPM file extension | Corel Corporation | CorelDRAW 10 Draw Media Lines |
| NPN file extension | ACD Systems International Inc. | Canvas Neon Pen |
| NPO file extension | Kostas lab | Nonpareil Redundancy Summary |
| NPP file extension | Nova Development | Art Explosion Publisher Pro Document Format |
| NPPD file extension | PremiumSoft CyberTech Ltd. | Navicat For PostgreSQL Data Synchronization Profile |
| NPPE file extension | PremiumSoft CyberTech Ltd. | Navicat For PostgreSQL Exported Table |
| NPPEQ file extension | PremiumSoft CyberTech Ltd. | Navicat For PostgreSQL Export Query Result Profile |
| NPPEV file extension | PremiumSoft CyberTech Ltd. | Navicat For PostgreSQL Export View Result Profile |
| NPPI file extension | PremiumSoft CyberTech Ltd. | Navicat For PostgreSQL Import Wizard Profile |
| NPPT file extension | PremiumSoft CyberTech Ltd. | Navicat For PostgreSQL Data Transfer Profile |
| NPR file extension | Steinberg Media Technologies | Nuendo Format |
| NPS file extension | NTI | NTI Backup Now Drive Based Backup Set Format |
| NPT file extension | N/A | Navicat For MySQL Data Transfer Profile Format |
| NPV file extension | Nexilogic | Pixbend Player Pixbend Media |
| NPW file extension | Nikola Dachev | NPassword |
| NPX file extension | NorPix Inc. | TroublePix Licence |
| NPZ file extension | INCA Internet Co, Ltd. | GameGuard Update |
| NQA file extension | STATCON | NQuery Advisor Data |
| NQC file extension | Dave Baum | NQC Not Quite C Source Code Format |
| NQF file extension | N/A | NOD32 Quarantine |
| NQI file extension | N/A | NOD32 Quarantine |
| NQST file extension | Adobe Systems Incorporated | SoundEdit |
| NR-VMP file extension | Rainer Goebel | BrainVoyager QX Native Resolution Volume Map |
| NR3 file extension | Nero AG | Nero CD-ROM (MP3) Compilation |
| NR4 file extension | Nero AG | Nero CD-ROM (AAC) Compilation |
| NRA file extension | Nero | Nero Audio-CD Compilation Format |
| NRB file extension | Nero | Nero CD-ROM Boot Compilation Format |
| NRBAK file extension | The Neat Company | Neat Backup |
| NRC file extension | Nero | Nero UDF/ISO CD-ROM Compilation |
| NRD file extension | Nero | Nero DVD-Video Compilation Format |
| NRE file extension | Nero AG | Nero CD EXTRA Compilation |
| NRF file extension | IBM | IBM Domino Notes Redirection |
| NRG file extension | Nero | Nero-Burning ROM CD Or DVD Image Format |
| NRH file extension | Nero AG | Nero Hybrid CD-ROM Compilation |
| NRI file extension | Nero | Nero CD-ROM (ISO) Compilation Format |
| NRJ file extension | N/A | Nero JukeBox Compilation |
| NRL file extension | Autonomy Interwoven | Autonomy Interwoven Link Format |
| NRM file extension | Nero | Nero Mixed-Mode-CD Compilation Format |
| NRMLIB file extension | The Neat Company | Neat Document Library |
| NRP file extension | e.World Technology Limited | ASP.NET Report Maker Report |
| NRS file extension | N/A | NovaBACKUP Restore Script Format |
| NRT file extension | Nokia | Nokia Ringtone Format |
| NRU file extension | Nero | Nero UDF CD-ROM Compilation Format |
| NRV file extension | Nero AG | Nero Video-CD Compilation |
| NRW file extension | Nikon | Nikon RAW Image Format |
| NRX file extension | The Neat Company | NeatReceipts SCANALIZER Expense Report |
| NS file extension | Procedimientos-Uno, S.L. | NSwin Project |
| NS1 file extension | Marius Milner | NetStumbler NS1 Log |
| NS2 file extension | IBM | Lotus Notes Database Format |
| NS3 file extension | IBM | Lotus Notes Database Format |
| NS4 file extension | IBM | Lotus Notes Database Format |
| NSA file extension | Nullsoft | Nullsoft Winamp Streaming Audio Format |
| NSBCA file extension | N/A | Nintendo DS Model Animation Format |
| NSBMD file extension | N/A | Nintendo DS Game 3D Model Format |
| NSBTA file extension | N/A | Nintendo DS Texture Animation Format |
| NSBTX file extension | N/A | Nintendo DS Model Texture Format |
| NSC file extension | Microsoft Corporation | Windows Media Station |
| NSCR file extension | Nintendo | Nintendo DS Title Screen Format |
| NSD file extension | Symantec Corporation | Norton System Doctor Sensor Configuration |
| NSE file extension | N/A | Nmap Security Scanner Scripting Engine |
| NSF file extension | IBM | Lotus Notes Database Format |
| NSFE file extension | N/A | Nintendo NES Audio File With Enhanced Tags |
| NSG file extension | IBM | Lotus Notes Database |
| NSH file extension | Nullsoft | NSIS Header Format |
| NSI file extension | Nullsoft | NSIS Nullsoft Scriptable Install System Script Format |
| NSLLOC file extension | Apple, Inc. | Apple Mac OS X Finder NSL Internet Location |
| NSPD file extension | PremiumSoft CyberTech Ltd. | Navicat For SQL Server Data Synchronization Profile |
| NSPE file extension | PremiumSoft CyberTech Ltd. | Navicat For SQL Server Exported Table |
| NSPEQ file extension | PremiumSoft CyberTech Ltd. | Navicat For SQL Server Export Query Result Profile |
| NSPEV file extension | PremiumSoft CyberTech Ltd. | Navicat For SQL Server Export View Result Profile |
| NSPI file extension | PremiumSoft CyberTech Ltd. | Navicat For SQL Server Import Wizard Profile |
| NSPL file extension | AOL Inc. | Netscape Navigator Plugin |
| NSPT file extension | PremiumSoft CyberTech Ltd. | Navicat For SQL Server Data Transfer Profile |
| NSQ file extension | Syntes | NScheduler Qlikview Schedule Format |
| NSR file extension | Tenable Network Security | Nessus Project Format |
| NSS file extension | IncrediMail | Magentic Screensaver Format |
| NST file extension | N/A | NoiseTracker Music Module |
| NSU file extension | NVIDIA Corporation | NVIDIA NTune Command System Profile Settings |
| NSV file extension | Nullsoft | Nullsoft Winamp Video Format |
| NSX file extension | Vista Software | Apollo Server Database Index |
| NSZ file extension | NVIDIA Corporation | Benchmark Data File Used By NVidia NTune Tool |
| NT file extension | Microsoft | Windows NT Command Script Format |
| NT7 file extension | Orchida Soft | Orchida Knitting System Pattern |
| NTC file extension | Nikon | Nikon Camera Control Pro Custom Curves Format |
| NTD file extension | NinjaTrader, LLC | NinjaTrader |
| NTF file extension | NEATO | MediaFACE CD Label Format |
| NTFP file extension | N/A | Nintendo DS Nitro File Palette |
| NTFS file extension | N/A | NTFS Partition Format |
| NTH file extension | Nokia | Nokia Series 40 And 60 Theme Format |
| NTJ file extension | IWR Computer Consultancy | Junction Box Backup |
| NTL file extension | N/A | Diablo 2 Mod D2NT Script |
| NTM file extension | GPS Moldova | Navitel Map |
| NTN file extension | N/A | NOTION Song Format |
| NTP file extension | NEATO | MediaFACE CD Label |
| NTRK file extension | Ubisoft Entertainment | Pacific Fighters Track Format |
| NTS file extension | IBM | Lotus Notes Traveler Server Config Format |
| NTT file extension | NEATO | MediaFACE Template |
| NTV file extension | Autometrix | PatternSmith Import |
| NTW file extension | Noteworthy Software, Inc. | Noteworthy Composer Song |
| NTX file extension | Clipper | Clipper Database Index Format |
| NTZ file extension | NetZ Computing | InVircible Antivirus Directory Integrity Information |
| NU4 file extension | Symantec Corporation | Norton Utilities DLL Root |
| NUB file extension | XEROX CORPORATION | Xerox FreeFlow NUB Init |
| NUC file extension | Ziheng Yang | PAML Data |
| NUD file extension | N/A | Now Up-To-Date Calendar Data |
| NUF file extension | Symantec Corporation | Procomm Plus New User Message |
| NUGET file extension | Outercurve Foundation | NuGet Package |
| NUGG file extension | SAP AG | SAP Generated Nugg |
| NUM file extension | Diction Software | Diction |
| NUMBERS file extension | Apple | Apple Numbers Spreadsheet Format |
| NUMBERS-TEF file extension | Apple | Apple Numbers ICloud Spreadsheet Format |
| NUP file extension | ESET | ESET Nod32 Antivirus Update Format |
| NUPKG file extension | NuGet | NuGet Source Code Package Format |
| NUSPEC file extension | NuGet | NuGet Settings Format |
| NUT file extension | N/A | NUT Open Container Format |
| NUV file extension | N/A | MythTV NuppelVideo Video Format |
| NV file extension | The MAME Team | MAME NVRAM Format |
| NV2 file extension | Q.W. Page Associates | NewViews 2 Accounting Data Format |
| NVAVI file extension | Nero AG | Split AVI Audio Video Interchange Format |
| NVC file extension | Nero | Nero Vision Express Project Format |
| NVD file extension | Savannah | Navidoc |
| NVDL file extension | International Standards Organization | NVDL Script |
| NVF file extension | Creative Labs | Creative Labs Nomad Voice Format |
| NVI file extension | NVIDIA | NVidia Graphics Card Driver Settings Format |
| NVJ file extension | Afreet Software Inc. | Net Vampire Job |
| NVL file extension | N/A | UniChem Results Format |
| NVM file extension | N/A | PlayStation 2 BIOS Configuration Format |
| NVP file extension | Afreet Software Inc. | Net Vampire Job |
| NVR file extension | National Creative Registry, Inc. | NeverForget |
| NVRAM file extension | VMware | VMware VM BIOS State Format |
| NVSG file extension | NVIDIA Corporation | NVIDIA SceniX Scene Management Engine Format |
| NVT file extension | N/A | NeuraLynx Video Tracker |
| NVX file extension | Novel CAE Solutions | NvStructural Extension |
| NVZ file extension | visualnovelty.com | Novelty Actor |
| NW3 file extension | Novell, Inc. | Novell Netware.3x |
| NW4 file extension | Novell, Inc. | Netware.4x |
| NWA file extension | Stardock Corporation | Natural Windows Animation |
| NWB file extension | Nikon Corporation | Nikon Capture White Balance |
| NWBAK file extension | The Neat Company | Neat Backup |
| NWC file extension | NoteWorthy | Noteworthy Composer Song Format |
| NWCAB file extension | The Neat Company | Neat Software Cabinet |
| NWCP file extension | Nisus Software, Inc. | Nisus Writer Pro Clipboard Document |
| NWCTXT file extension | NoteWorthy | NoteWorthy Composer Text Format |
| NWD file extension | Autodesk | NavisWorks Snapshot Format |
| NWDB file extension | The Neat Company | NeatReceipts Database |
| NWELICENSE file extension | Nisus Software, Inc. | Nisus Writer Pro License |
| NWF file extension | Autodesk | NavisWorks Project Format |
| NWM file extension | N/A | Sony NWM Display Screen Format |
| NWN file extension | BioWare | Bioware Aurora Engine Module |
| NWP file extension | IncrediMail | Magentic Content Format |
| NWS file extension | Microsoft | Microsoft Outlook Express News Message Format |
| NWUT file extension | Novell, Inc. | NetWare Tools |
| NWV file extension | Nuance | Dragon NaturallySpeaking User Archive Format |
| NWX file extension | LucasArts Entertainment Company, LLC | Outlaws Choreography |
| NW_ file extension | Noteworthy Software, Inc. | Noteworthy Composer Compressed |
| NX1 file extension | NexusDB Pty Ltd. | NexusDB Database |
| NX2 file extension | NexusDB Pty Ltd. | NexusDB Database |
| NXB file extension | Nexus Marine AB | Nexus Race Software Raw Data |
| NXC file extension | The LEGO Group | NXC Not EXactly C Source Code Format |
| NXD file extension | TruTamil LLC | NdxCards Index Card Project |
| NXG file extension | Netopia | ESite Builder NXG Web Page Format |
| NXN file extension | Avid Technology, Inc. | Avid Interplay Permanent License |
| NXT file extension | Next, Inc. | NeXT Sound |
| NX^D file extension | Apple, Inc. | WriteNow 2 Document |
| NY file extension | N/A | Nyquist Plug-in Format |
| NYF file extension | Wjj Software | MyBase Database Format |
| NZ file extension | Sami Runsas | NanoZip Compressed Archive |
| NZB file extension | NewzBin.com | Newzbin Download Pointer Format |
| NZL file extension | Corel Corporation | Corel Painter Nozzle |
| NZN file extension | N/A | RMCProfile List |
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