| .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 |
