| .n | Neko Bytecode Format |
| .n-gage | Nokia N-Gage Application Format |
| .n2 | Nitrous Minecraft GLSL Shader Format |
| .n2km | Headshape Modding 3D Tool For 3D Studio Max Modding |
| .n3d | Nuclear Studio 3D Model Format |
| .n3pmesh | Knight Online 3D Mesh Format |
| .n64 | Nintendo 64 Emulation ROM Image Format |
| .n81 | Apple IOS Kernel Cache |
| .n88 | Apple IOS Kernel Cache |
| .n90 | Apple IOS Kernel Cache |
| .n90ap | IPhone Jailbreak Firmware |
| .n92 | Apple IOS Firmware |
| .na2 | Seamonkey Address Book Format |
| .nab | Netscape Communicator Addressbook |
| .nacl | NameCleaner |
| .naf | TRAKTOR Service |
| .nal | System Management Server Network Abstraction Layer |
| .nam | DMAP Spreadsheet Format |
| .nap | NAPLPS Vector Image Metafile |
| .napr | NameCleaner Preference |
| .narc | Nintendo DS Archive Format |
| .narrative | Mariner Software Narrator Audio Document |
| .nas | Nasal Script |
| .nav | Counter-Strike Source CBot Navigation Mesh Format |
| .nav2 | WinAVI Temporary Navigation Format |
| .navmap | ESRI Data |
| .naz | Total Overdose Game Data Format |
| .nb | Mathematica Notebook Format |
| .nb0 | Google Android Compiled ROM Format |
| .nb2 | Newsbin Unfinished Download |
| .nb7 | NovaBACKUP Output Data Backup Format |
| .nba | Nero BackItUp Archive Format |
| .nbak | Neat Backup |
| .nbc | Next Byte Codes Source Code Format |
| .nbd | PC Backup Pro Backup Format |
| .nbe | Nessus Scan Result Format |
| .nbf | Backup NOW! Backup Archive Format |
| .nbfc | Nintendo DS Nitro Basic File Character |
| .nbfp | Nintedo DS Nitro Basic File Palette |
| .nbfs | Nintendo DS Nitro Basic File Screen |
| .nbh | HTC ROM Update Utility ROM Image Format |
| .nbi | Nero BackItUp Backup Format |
| .nbin | Compiled NASL Script |
| .nbk | NovaBACKUP Script Format |
| .nbl | Phantasy Star Universe |
| .nbm | NetBeans Module Format |
| .nbp | Mathematica Notebook Format |
| .nbr | Saved Benchmark Result |
| .nbs | NTI Backup Now Format Based Backup Set Format |
| .nbt | Minecraft Named Binary Tag Format |
| .nbu | Nokia PC Suite 6.82+ Backup Format |
| .nbz | ArcSoft Total Media Backup & Record Backup |
| .nc | Unidata Network Common Data Form Format |
| .nc1 | Xsteel CAD |
| .nc2 | NewsLeecher Cache |
| .nc? | FlashGet Download Manager Incomplete Download |
| .nca | Nikon Capture Color Adjustment |
| .ncb | Microsoft Developer Studio Non-compiled Browse Format |
| .ncc | CNC (Computer Numeric Control) Control File (CamView 3D) |
| .ncd | NTI CD-Maker Disk Image |
| .ncer | Nintendo DS Nitro Cell Resource |
| .ncf | Steam Client Game Configuration Format |
| .ncfg | ArcGIS Explorer Configuration Format |
| .ncgr | Nintendo DS Title Graphics Format |
| .nch | Microsoft Outlook Express Email Tree |
| .nci | Mastercam Toolpath |
| .nclk | HTML Formatted Text |
| .nclr | Nintendo DS Color Palette Format |
| .nco | Nero BackItUp Compressed Backup Format |
| .ncomp | SAM Dirichlet Mixture Prior Library |
| .ncor | Adobe Encore Project Format |
| .ncorx | Adobe Encore Project Format |
| .ncp | NHL Ice Hockey 2002 User NHLcards |
| .ncr | NCR Image Image Format |
| .ncs | Bioware Aurora / Obsidian Electron Compiled Script |
| .ncss | NCSS Data |
| .nct | CoverDesigner Template |
| .ncv | Nikon Capture Curves |
| .ncw | Nero CoverDesigner Picture Template Format |
| .ncx | Navigation Control File For XML |
| .ncz | Netcad Drawing |
| .nd | QuickBooks Network Data Format |
| .nd5 | Nintendo DS Game ROM Format |
| .nda | Nero BackItUp Drive Image |
| .ndb | ClamAV Extended Signature Format |
| .ndc | IBM Personal Communications Settings Format |
| .ndd | Nikon Capture Digital DEE |
| .ndf | Microsoft SQL Server Secondary Data Format |
| .ndif | Apple NDIF Disk Image Format |
| .ndk | Lotus Notes Database Design Elements |
| .ndl | Lotus Notes Data Format |
| .ndm | Enemy Territory Quake Wars Demo |
| .ndo | Nendo |
| .ndoc | Naver Word |
| .ndots | Ribbons Ndots |
| .ndp | Nick-O-Matic Design Factory Project |
| .ndr | RightFax Executable |
| .nds | Nintendo DS Game ROM Image Format |
| .ndt | NEPLAN External Program Import Or Export |
| .ndu | Symbian Phone Backup |
| .ndv | ENVI N-D Visualizer State |
| .ndw | Allplan Drawing |
| .ndx | DBase Index Format |
| .ne0 | NetBSD Config |
| .ne1 | OM2 OMALI NENA Version 1 Document |
| .ne3 | OM2 OMALI NENA Document |
| .ned | OMNet++ Network Description Format |
| .nef | Nikon Digital SLR Camera RAW Image Format |
| .neko | Neko Source Code Format |
| .nen | Nick-O-Matic Design Factory Project |
| .neo | Atari NeoChrome Bitmap Image |
| .neosave | Neopets Puzzle Adventure Saved Game |
| .nepprj | NEPLAN Project |
| .nes | Nintendo Entertainment System ROM Image |
| .nessus | Nessus Network Security Scanner Format |
| .net | Network Configuration Format |
| .neta | Netica Bayesian Network Binary Format |
| .netboot | Unix Netboot Script |
| .netkit | Gnome Desktop |
| .netrc | .netrc TCP/IP Settings |
| .netsh | Netsh File Extension |
| .netspd | NetSpot Survey Project Format |
| .netspm | NetSpot Map Format |
| .networkconnect | Apple Network Connect Document |
| .neu | Pro/Engineer Neutral Format |
| .neulicense | Neu License |
| .new | Ameco Embroidery Format |
| .newsloc | Apple Mac OS X Finder News Internet Location |
| .nex | Neuroexplorer Neurological Data |
| .nexe | Google Chrome Native Client Executable Format |
| .nez | NES ROM Emulator Image |
| .nfb | Nokia PC Suite Phone Backup Format |
| .nfc | Nokia PC Suite Phone Backup Format |
| .nff | Haines Neutral File Format |
| .nfg | NewsBin Configuration |
| .nfi | Dreambox Disc Image Format |
| .nfl | AutoCAD Multiline Filter List |
| .nfm | Delphi .NET Form Format |
| .nfo | Information Readme Text Format |
| .nfp | Archive |
| .nfs | Network Format System Temporary Format |
| .nfs11save | Need For Speed: Hot Pursuit 2010 Configuration Format |
| .nfs13save | Need For Speed: Most Wanted Saved Game |
| .nft | NetObjects Fusion System |
| .nftr | Nintendo DS Font Type Format |
| .nfx | NetObjects Fusion Components Bbscomp |
| .ngage | Nokia N-Gage Game Format |
| .ngc | Xilinx Integrated Software Environment Generated Format |
| .ngd | NimbleGen Gene Description Format |
| .ngg | Nokia Group Graphics Image Format |
| .ngh | Neighbours From Hell 2 Saved Game |
| .ngloss | Nisus Writer Pro Glossary |
| .ngn | Fly! Engine Specification |
| .ngo | Nick-O-Matic Design Factory Project |
| .ngp | Neo Geo Pocket ROM Image Format |
| .ngr | NEPLAN Graphic Data |
| .ngrr | GUITAR RIG Sound |
| .ngs | NGSSniff |
| .ngt | NONI GPSPlot GIS Format |
| .nh | NetHack Defaults |
| .nha | Native Noah Format |
| .nhb | No Hands Backup Backup Description |
| .nhd | Nero AVHCD DVD Compilation |
| .nhf | Nero HFS-CD Compilation |
| .nhl | Nhl Ice Hockey Game 2002 User Teams |
| .nhn | Ijji REACTOR Html Launch |
| .nhp | NOAA Hydrophone Data |
| .nhs | NHibernate |
| .nhv | Nero HD-BURN-Video Compilation |
| .ni | NetObjects Fusion Preview |
| .nia | Nikon Capture Image Adjustment |
| .nib | Interface Builder User Interface Resources |
| .nick | Microsoft Outlook Nickname Format |
| .nicnt | Native Instruments KONTAKT Library |
| .nicrash | TRAKTOR Crash Report |
| .nid | Nikon Capture IPTC Data |
| .nif | GameBryo Format |
| .niff | NIFF Navy Image File Format |
| .nil | Norton Icon Library |
| .nim | Nimrod Source Code Format |
| .nip | Microsoft DRM (Digital Right Management) |
| .nist | Audio |
| .nit | ArcView INFO Table Definitions |
| .nitf | National Imagery Transmission Format |
| .nix | Rational XDE |
| .njb | Nikon Digital SLR Camera Image Index Format |
| .njf | IBM Lotus Domino |
| .nji | Nero BackItUp Job Format |
| .njt | Nero BackItUp Job Template |
| .njx | NJStar Document Format |
| .nk | NUKE Script Format |
| .nk2 | Microsoft Outlook Contacts AutoComplete Format |
| .nkb | Kontakt Audio Bank |
| .nkc | Native Instruments KONTAKT Library Data Format |
| .nkd | Nikon ViewNX Thumbnail Cache |
| .nki | Native Instruments Instruments Sample Format |
| .nkm | Native Instruments KONTAKT Format |
| .nkp | Kontakt Saved Presets |
| .nkr | KONTAKT Resource Container |
| .nks | Native Instruments Archive Format |
| .nkx | Native Instruments Monolith Format |
| .nl | Norton Desktop Icon Library |
| .nl2 | ESignal Market Depth |
| .nlang3 | Ashampoo Internet Accelerator Language |
| .nlb | Colin McRae Rally Network Leader Boards Game |
| .nlc | Nero Linux Compilation |
| .nlelem | NoLimits Rollercoaster Simulation Track Element Format |
| .nlg | Nestopia Language |
| .nlk | Outlook 2003 E-mail Cookie |
| .nlm | Nokia Logo File Image Format |
| .nlogo | NetLogo Model Format |
| .nlogo3d | NetLogo 3D Model Format |
| .nlpd | Navicat For SQLite Data Synchronization Profile |
| .nlpe | Navicat For SQLite Exported Table |
| .nlpeq | Navicat For SQLite Export Query Result Profile |
| .nlpev | Navicat Export View Result Profile |
| .nlpi | Navicat For SQLite Import Wizard Profile |
| .nlpt | Navicat For SQLite Data Transfer Profile |
| .nlpx | Mad Data NoLimits Game Data Format |
| .nlr | NLREG Nonlinear Regression Control |
| .nls | Microsoft National Language Support Format |
| .nltrack | NoLimits Roller Coaster Track Format |
| .nlv | Nikon Capture LCHE Editor |
| .nm | Space Engine Nebula Model Format |
| .nm2 | Navitel Navigator Map Format |
| .nm3 | Navitel Navigator 5.0 Map Format |
| .nm5 | NovaMind Mind Map |
| .nm7 | Navitel Navigator Map |
| .nmap | NaviComputer Map Format |
| .nmbd | Samba Log |
| .nmbtemplate | Apple Numbers Spreadsheet Template Format |
| .nmc | ArcGIS Explorer Map Content Format |
| .nmd | Nero MiniDVD Compilation |
| .nmf | ArcGIS Explorer Map Format |
| .nmi | SwordSearcher |
| .nmind | NovaMind Mind Map Format |
| .nmk | Microsoft Program Maintenance Utility Make |
| .nml | Traktor Collection Format |
| .nmm | Microsoft 3D Movie Maker Video |
| .nmo | Virtools Behavioral Objects |
| .nmp | Neopaint Mask Image Format |
| .nmr | WxNUTS Histogram |
| .nms | Numega SoftICE Loader File Including Debugging Info |
| .nmsv | Native Instruments MASSIVE Audio |
| .nmu | EMC Documentum Client Library Query Cache |
| .nmv | Nintendulator Movie Capture |
| .nmw | Microsoft NetMeeting T126_Whiteboard |
| .nn | Nero CD List Format |
| .nni | ANNI Neural Network Investing Format |
| .nnp | ANNI Neural Network Portfolio Format |
| .nnr | Nikon Capture Noise Reduction |
| .nntp | NewsWatcher |
| .nnvs | NextNine VNC Player VNC Session |
| .nnw | NeuralWare NeuralWorks |
| .nob | Silver Game Data |
| .nod | NetObjects Fusion Nodes Format |
| .nodes | PowerFolder Nodes |
| .nof | NetObject Fusion 5.0 |
| .noindex | Mac OS X Spotlight Index |
| .nokia | Nokia Proprietary Ringtone Format |
| .nokogiri | Nokogiri Source |
| .noktxt | Nokia Proprietary Ringtone Text Format |
| .nol | Nokia Operator Logo Image Format |
| .nomedia | Google Android OS System Format |
| .non | Star Wars: Tie Fighter Mouse Options |
| .nop | Nokia Smart Shoot RAW Photo |
| .nopd | Navicat For Oracle Data Synchronization Profile |
| .nope | Navicat For Oracle Exported Table |
| .nopem | Navicat For Oracle Export Materialized View Profile |
| .nopeq | Navicat For Oracle Export Query Result Profile |
| .nopev | Navicat For Oracle Export View Result Profile |
| .nopi | Navicat For Oracle Import Wizard Profile |
| .nopt | Navicat For Oracle Data Transfer Profile |
| .nor | Norwegian Localization |
| .nos | JDOS System |
| .not | Notation Or Note Format |
| .note | Notability For IPad Note Format |
| .notebook | SMART Notebook Format |
| .notes | Memento Note Format |
| .notx | E-Sword Study |
| .not_terminated | Mac OS X Audit Log |
| .nov | NI Battery Cache |
| .novs | Novell NetWare Control Center |
| .now | Visual FoxPro Documenting Wizard List |
| .nox | Wave IRIS NOx |
| .np | Portfolio NetPublish Web Template Format |
| .npa | ReliaSoft Weibull++ |
| .npb | Navicat For MySQL Backup Profile |
| .npc | QuickBooks Online Banking |
| .npd | Navicat For MySQL Data Synchronize Profile |
| .npdt | Mac Text |
| .npe | Navicat For MySQL Export Profile |
| .npeq | Navicat For MySQL Export Query Result Profile |
| .npev | Navicat For MySQL Export View Result Profile |
| .npf | NTI Backup Format |
| .npfx | Norton Internet Security Settings Format |
| .npg | Magentic Download |
| .npi | Navicat For MySQL Import Wizard Profile |
| .npj | Navicat For MySQL Batch Job |
| .npk | N-Track Studio Peak |
| .npl | Nokia Audio Format |
| .npm | CorelDRAW 10 Draw Media Lines |
| .npn | Canvas Neon Pen |
| .npo | Nonpareil Redundancy Summary |
| .npp | Art Explosion Publisher Pro Document Format |
| .nppd | Navicat For PostgreSQL Data Synchronization Profile |
| .nppe | Navicat For PostgreSQL Exported Table |
| .nppeq | Navicat For PostgreSQL Export Query Result Profile |
| .nppev | Navicat For PostgreSQL Export View Result Profile |
| .nppi | Navicat For PostgreSQL Import Wizard Profile |
| .nppt | Navicat For PostgreSQL Data Transfer Profile |
| .npr | Nuendo Format |
| .nps | NTI Backup Now Drive Based Backup Set Format |
| .npt | Navicat For MySQL Data Transfer Profile Format |
| .npv | Pixbend Player Pixbend Media |
| .npw | NPassword |
| .npx | TroublePix Licence |
| .npz | GameGuard Update |
| .nqa | NQuery Advisor Data |
| .nqc | NQC Not Quite C Source Code Format |
| .nqf | NOD32 Quarantine |
| .nqi | NOD32 Quarantine |
| .nqst | SoundEdit |
| .nr-vmp | BrainVoyager QX Native Resolution Volume Map |
| .nr3 | Nero CD-ROM (MP3) Compilation |
| .nr4 | Nero CD-ROM (AAC) Compilation |
| .nra | Nero Audio-CD Compilation Format |
| .nrb | Nero CD-ROM Boot Compilation Format |
| .nrbak | Neat Backup |
| .nrc | Nero UDF/ISO CD-ROM Compilation |
| .nrd | Nero DVD-Video Compilation Format |
| .nre | Nero CD EXTRA Compilation |
| .nrf | IBM Domino Notes Redirection |
| .nrg | Nero-Burning ROM CD Or DVD Image Format |
| .nrh | Nero Hybrid CD-ROM Compilation |
| .nri | Nero CD-ROM (ISO) Compilation Format |
| .nrj | Nero JukeBox Compilation |
| .nrl | Autonomy Interwoven Link Format |
| .nrm | Nero Mixed-Mode-CD Compilation Format |
| .nrmlib | Neat Document Library |
| .nrp | ASP.NET Report Maker Report |
| .nrs | Nero CD-ROM Boot EFI Compilation Format |
| .nrt | Nokia Ringtone Format |
| .nru | Nero UDF CD-ROM Compilation Format |
| .nrv | Nero Video-CD Compilation |
| .nrw | Nikon RAW Image Format |
| .nrx | NeatReceipts SCANALIZER Expense Report |
| .ns | NSwin Project |
| .ns1 | NetStumbler NS1 Log |
| .ns2 | Lotus Notes Database Format |
| .ns3 | Lotus Notes Database Format |
| .ns4 | Lotus Notes Database Format |
| .nsa | Nullsoft Winamp Streaming Audio Format |
| .nsbca | Nintendo DS Model Animation Format |
| .nsbmd | Nintendo DS Game 3D Model Format |
| .nsbta | Nintendo DS Texture Animation Format |
| .nsbtx | Nintendo DS Model Texture Format |
| .nsc | Windows Media Station |
| .nscr | Nintendo DS Title Screen Format |
| .nsd | Norton System Doctor Sensor Configuration |
| .nse | Nmap Security Scanner Scripting Engine |
| .nsf | Lotus Notes Database Format |
| .nsfe | Nintendo NES Audio File With Enhanced Tags |
| .nsg | Lotus Notes Database |
| .nsh | Lotus Notes Database Format |
| .nsi | Symantec Shared Format |
| .nslloc | Apple Mac OS X Finder NSL Internet Location |
| .nspd | Navicat For SQL Server Data Synchronization Profile |
| .nspe | Navicat For SQL Server Exported Table |
| .nspeq | Navicat For SQL Server Export Query Result Profile |
| .nspev | Navicat For SQL Server Export View Result Profile |
| .nspi | Navicat For SQL Server Import Wizard Profile |
| .nspl | Netscape Navigator Plugin |
| .nspt | Navicat For SQL Server Data Transfer Profile |
| .nsq | NScheduler Qlikview Schedule Format |
| .nsr | Nessus Project Format |
| .nss | Magentic Screensaver Format |
| .nst | NoiseTracker Music Module |
| .nsu | NVIDIA NTune Command System Profile Settings |
| .nsv | Nullsoft Winamp Video Format |
| .nsx | Apollo Server Database Index |
| .nsz | Benchmark Data File Used By NVidia NTune Tool |
| .nt | Windows NT Command Script Format |
| .nt7 | Orchida Knitting System Pattern |
| .ntc | Nikon Camera Control Pro Custom Curves Format |
| .ntd | NinjaTrader |
| .ntf | Lotus Notes Database Template Format |
| .ntfp | Nintendo DS Nitro File Palette |
| .ntfs | NTFS Partition Format |
| .nth | Nokia Series 40 And 60 Theme Format |
| .ntj | Junction Box Backup |
| .ntl | Diablo 2 Mod D2NT Script |
| .ntm | Navitel Map |
| .ntn | NOTION Song Format |
| .ntp | MediaFACE CD Label |
| .ntrk | Pacific Fighters Track Format |
| .nts | Lotus Notes Traveler Server Config Format |
| .ntt | MediaFACE Template |
| .ntv | PatternSmith Import |
| .ntw | Noteworthy Composer Song |
| .ntx | Clipper Database Index Format |
| .ntz | InVircible Antivirus Directory Integrity Information |
| .nu4 | Norton Utilities DLL Root |
| .nub | Xerox FreeFlow NUB Init |
| .nuc | PAML Data |
| .nud | Now Up-To-Date Calendar Data |
| .nuf | Procomm Plus New User Message |
| .nuget | NuGet Package |
| .nugg | SAP Generated Nugg |
| .num | Diction |
| .numbers | Apple Numbers Spreadsheet Format |
| .numbers-tef | Apple Numbers ICloud Spreadsheet Format |
| .nup | ESET Nod32 Antivirus Update Format |
| .nupkg | NuGet Source Code Package Format |
| .nuspec | NuGet Settings Format |
| .nut | NUT Open Container Format |
| .nuv | MythTV NuppelVideo Video Format |
| .nv | MAME NVRAM Format |
| .nv2 | NewViews 2 Accounting Data Format |
| .nvavi | Split AVI Audio Video Interchange Format |
| .nvc | Nero Vision Express Project Format |
| .nvd | Navidoc |
| .nvdl | NVDL Script |
| .nvf | Creative Labs Nomad Voice Format |
| .nvi | NVidia Graphics Card Driver Settings Format |
| .nvj | Net Vampire Job |
| .nvl | UniChem Results Format |
| .nvm | PlayStation 2 BIOS Configuration Format |
| .nvp | Net Vampire Job |
| .nvr | NeverForget |
| .nvram | VMware VM BIOS State Format |
| .nvsg | NVIDIA SceniX Scene Management Engine Format |
| .nvt | NeuraLynx Video Tracker |
| .nvx | NvStructural Extension |
| .nvz | Novelty Actor |
| .nw3 | Novell Netware.3x |
| .nw4 | Netware.4x |
| .nwa | Natural Windows Animation |
| .nwb | Nikon Capture White Balance |
| .nwbak | Neat Backup |
| .nwc | Noteworthy Composer Song Format |
| .nwcab | Neat Software Cabinet |
| .nwcp | Nisus Writer Pro Clipboard Document |
| .nwctxt | NoteWorthy Composer Text Format |
| .nwd | NavisWorks Snapshot Format |
| .nwdb | NeatReceipts Database |
| .nwelicense | Nisus Writer Pro License |
| .nwf | NavisWorks Project Format |
| .nwm | Sony NWM Display Screen Format |
| .nwn | Bioware Aurora Engine Module |
| .nwp | Noteworthy Player Format Type |
| .nws | Microsoft Outlook Express News Message Format |
| .nwut | NetWare Tools |
| .nwv | Dragon NaturallySpeaking User Archive Format |
| .nwx | Outlaws Choreography |
| .nw_ | Noteworthy Composer Compressed |
| .nx1 | NexusDB Database |
| .nx2 | NexusDB Database |
| .nxb | Nexus Race Software Raw Data |
| .nxc | NXC Not EXactly C Source Code Format |
| .nxd | NdxCards Index Card Project |
| .nxg | ESite Builder NXG Web Page Format |
| .nxn | Avid Interplay Permanent License |
| .nxt | NeXT Sound |
| .nx^d | WriteNow 2 Document |
| .ny | Nyquist Plug-in Format |
| .nyf | MyBase Database Format |
| .nz | NanoZip Compressed Archive |
| .nzb | Newzbin Download Pointer Format |
| .nzl | Corel Painter Nozzle |
| .nzn | RMCProfile List |
File extensions are not normally displayed to users. To change this, go to Control Panel, select Appearance and Personalization and Folder Options. Next, select the View and find the option "Hide extensions for known file types". The option should be deselected (cleared) and confirmed with OK.
