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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .N1 | Symantec Corporation | Data Files | Nuke Randomic Life Generator File | AVG Antivirus | AVG Technologies |
| .N2P | Unknown Developer | Data Files | Net2Phone Data | Net2Phone | Unknown Developer |
| .NAD | Malcolm Sambridge | Data Files | Neighbourhood Algorithm | na-bayes | Malcolm Sambridge |
| .NAF | Native Instruments | Data Files | TRAKTOR Service Data File | Traktor | Native Instruments |
| .NAI | Unknown Developer | Data Files | WinINSTALL Data | Unknown Software | Unknown Developer |
| .NAL | Novell, Inc. | Data Files | Novell ZENworks Suite Network Delivered Application Shortcut File Format | ZENworks Suite | Novell, Inc. |
| .NAM | Aqua-3D | Data Files | Aqua3D Network File | Aqua3D | Unknown Developer |
| .NAMES | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .NAP | McAfee, Inc. | Data Files | McAfee ePO Network Associates Package | McAfee ePolicy Orchestrator | McAfee, Inc. |
| .NAS | MSC Software | Data Files | Nastran Input File | MSC Nastran | MSC Software |
| .NASL | Tenable | Data Files | Nessus Attack Scripting Language Key File | Nessus | Tenable |
| .NATVIS | Microsoft Corporation | Data Files | Microsoft Visual Studio Text Data | Microsoft Visual Studio | Microsoft Corporation |
| .NBE | Tenable | Data Files | Nessus Report File | Nessus | Tenable |
| .NBK | SMART Technologies | Data Files | SMART Notebook File | MimioStudio | Mimio |
| .NBP | Wolfram Research | Data Files | Mathematica Player Notebook File | Wolfram Research Mathematica | Wolfram Research |
| .NC | CNC Software | Data Files | Mastercam Numerical Control File | Mastercam | CNC Software |
| .NCC | Robert A. Pemberton | Data Files | CamView 3D File | CamView 3D | Robert A. Pemberton |
| .NCE | Miroslav Rajčić | Data Files | NoteCase Pro Encrypted Document | NoteCase Pro | Miroslav Rajčić |
| .NCF | Valve | Data Files | No Cache File | GCFScape | Open Source |
| .NCG | Native Instruments | Data Files | Native Instruments Controller Editor Template | Controller Editor | Native Instruments |
| .NCT | Interscape | Data Files | Now Contact File | Now Up-to-Date (Now Contact) | Now Software |
| .NDB | Naviter | Data Files | SeeYou Waypoint File | SeeYou | Naviter |
| .NDF | Microsoft Corporation | Data Files | SQL Server Secondary Database File | Microsoft SQL Server | Microsoft Corporation |
| .NDK | IBM | Data Files | Lotus Notes Design Elements File | IBM Lotus Notes | IBM |
| .NDM | PremiumSoft CyberTech Ltd | Data Files | Navicat Data Modeler Database Model | Navicat for MySQL | PremiumSoft CyberTech Ltd |
| .NDR | Nikon | Data Files | Nikon Capture Image Dust Off File | Nikon Capture NX | Nikon |
| .NDS | Nintendo | Data Files | Nintendo DS Game ROM | No Cash GBA (No$GBA) | Martin Korth |
| .NDT | NEPLAN AG | Data Files | NEPLAN External Program Import/ Export File | NEPLAN Electricity | NEPLAN AG |
| .NDV | Exelis Inc. | Data Files | ENVI N-D Visualizer State Data | ENVI | Exelis Inc. |
| .NDX | Unknown Developer | Data Files | dBASE Index File | Microsoft Visual FoxPro | Microsoft Corporation |
| .NEC | W7EL | Data Files | NEC Antenna Data | EZNEC | W7EL |
| .NED | OpenSim Ltd | Data Files | OMNeT++ Network Description File | OMNeT++ | OpenSim Ltd |
| .NET | Netviz LLC | Data Files | NetViz Project File | netViz Enterprise software | Netviz LLC |
| .NETA | Norsys Software Corp | Data Files | Netica Binary File | Norsys Netica | Norsys Software Corp |
| .NETCDF | University Corporation for Atmospheric Research (UCAR) | Data Files | Scientific Data NETwork Common Data Format | Ferret | NOAA |
| .NEX | Opera Software | Data Files | Navigator Extension | Opera | Opera Software |
| .NF | Unknown Developer | Data Files | CVIP NF_help File | Unknown Software | Unknown Developer |
| .NF2 | National Creative Registry | Data Files | NeverForget Data File | NeverForget | National Creative Registry |
| .NFI | Dream Multimedia | Data Files | Dreambox Disc Image | FlashWizard PRO | DreamLogic Software |
| .NFL | Nokia | Data Files | Nokia Flash Lite Package | WinRAR | Eugene Roshal |
| .NFO | Microsoft Corporation | Data Files | System Information File | Microsoft System Information | Microsoft Corporation |
| .NFS | Codemasters | Data Files | F1 2015 Speech Data | F1 2015 | Codemasters |
| .NFT | NetObjects | Data Files | NetObjects Fusion System Data | NetObjects Fusion | NetObjects |
| .NFX | NetObjects | Data Files | NetObjects Fusion Components Bbscomp Data | NetObjects Fusion | NetObjects |
| .NG | Symantec Corporation | Data Files | Norton Guide Online Documentation Database | Norton Desktop | Symantec Corporation |
| .NGD | Xilinx, Inc. | Data Files | Xilinx Netlist File | ISE Design Suite | Xilinx, Inc. |
| .NGE | Nexus Group | Data Files | NeXus Personal Security Client Data | neXus Personal Security Client | Nexus Group |
| .NGG | Nokia | Data Files | Nokia Group Graphics Image Format File | Nokia phones | Nokia |
| .NGR | NEPLAN AG | Data Files | NEPLAN Graphic Data | NEPLAN Electricity | NEPLAN AG |
| .NGS | 5pb. and Nitroplus | Data Files | Steins;Gate Game File | Steins;Gate | 5pb. and Nitroplus |
| .NHF | Nero AG | Data Files | Nero HFS CD Compilation | Nero Burning ROM | Nero AG |
| .NHM | Microsoft Corporation | Data Files | Microsoft Systems Management Server (SMS) Data | Microsoft Systems Management Server | Microsoft Corporation |
| .NI | NetObjects | Data Files | Netobjects Fusion Preview File | NetObjects Fusion | NetObjects |
| .NICNT | Native Instruments | Data Files | Native Instruments KONTAKT Library | Native Instruments Kontakt | Native Instruments |
| .NICRASH | Native Instruments | Data Files | TRAKTOR Crash Report | Traktor | Native Instruments |
| .NID | Nikon | Data Files | Nikon Capture IPTC Data | Nikon Capture NX | Nikon |
| .NIF | Gamebase | Data Files | Gamebryo Model File | Gamebryo | Gamebase |
| .NII | Unknown Developer | Data Files | NIfTI-1 Data Format | Unknown Software | Unknown Developer |
| .NIL | Symantec Corporation | Data Files | Norton Icon Library Icon Set | Norton Utilities | Symantec Corporation |
| .NIR | Flexera Software | Data Files | AdminStudio Repackaging Wizard Output | AdminStudio | Flexera Software |
| .NITF | U.S. Department of Defense | Data Files | National Imagery Transmission Format File | GDAL | Open Source |
| .NIV | Open Source | Data Files | TheWord New International Version Module | theWord | Costas stergiou |
| .NIX | IBM | Data Files | Rational XDE Data | Rational Rose | IBM |
| .NKI | Native Instruments | Data Files | KONTAKT Instrument File | Native Instruments Kontakt | Native Instruments |
| .NKR | Native Instruments | Data Files | KONTAKT Resource Container | Native Instruments Kontakt | Native Instruments |
| .NKY | NUM | Data Files | NUMROTOplus Keyfile | NUMROTOplus | NUM |
| .NL | Kdan Mobile Software Ltd | Data Files | Note Ledge File | NoteLedge | Kdan Mobile Software Ltd |
| .NLB | Oracle Corporation | Data Files | Oracle Locale Builder Binary File | Oracle Locale Builder | Oracle Corporation |
| .NLF | ClickTracks Analytics, Inc | Data Files | ClickTracks Normalized Log | ClickTracks | ClickTracks Analytics, Inc |
| .NLO | IBM | Data Files | Lotus Notes Linked Object | IBM Lotus Notes | IBM |
| .NLP | NirSoft | Data Files | NirLauncher Package | NirLauncher | NirSoft |
| .NLR | Phillip H. Sherrod | Data Files | NLREG Nonlinear Regression Control File | NLREG | Phillip H. Sherrod |
| .NLS | Uri Wilensky | Data Files | NetLogo Source Code File | MacroMates TextMate | MacroMates |
| .NMA | National Marine Electronics Association (NMEA) | Data Files | NMEA Data File | GPSBabel | Open Source |
| .NMEA | Interscape | Data Files | NMEA GPS Data File | NMEA to KML Converter | Interscape |
| .NMI | StudyLamp Software | Data Files | SwordSearcher Data | SwordSearcher | StudyLamp Software |
| .NML | Native Instruments | Data Files | Traktor Collection File | Traktor | Native Instruments |
| .NMO | Dassault Systèmes | Data Files | 3DVIA Virtools Behavioral Object File | 3DVIA Virtools | Dassault Systèmes |
| .NMV | Open Source | Data Files | Nintendulator Movie Capture File | Nintendulator | Open Source |
| .NMW | Microsoft Corporation | Data Files | Microsoft NetMeeting T126_Whiteboard File Format | Microsoft NetMeeting | Microsoft Corporation |
| .NND | CYME International | Data Files | CYMFLOW Network Data | CYMFLOW | CYME International |
| .NNG | Pioneer DJ Corporation | Data Files | Pioneer AVIC Navigation Unit Data | Unknown Software | Unknown Developer |
| .NNI | Oolution Technologies | Data Files | ANNI Information File | ANNI SOFTWARE | Oolution Technologies |
| .NNP | Oolution Technologies | Data Files | ANNI Neural Network Portfolio Data | ANNI SOFTWARE | Oolution Technologies |
| .NNVS | NextNine Ltd. | Data Files | NextNine VNC Player VNC Session File | NextNine VNC player | NextNine Ltd. |
| .NOM | PTC | Data Files | Aonix Nomad File | Nomad Software | PTC |
| .NORMAL | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .NOT | Notation Software | Data Files | Notation File | Notation Musician | Notation Software |
| .NOTEBOOK | SMART Technologies | Data Files | SMART Notebook File | MimioStudio | Mimio |
| .NOTEPAD | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .NP | Extensis | Data Files | Portfolio NetPublish File | Portfolio | Extensis |
| .NPA | 5pb. and Nitroplus | Data Files | Steins;Gate Archive File | Steins;Gate | 5pb. and Nitroplus |
| .NPD | Netrosoft Corporation | Data Files | Netrosoft Presentation Document | Netrosoft Office Suite | Netrosoft Corporation |
| .NPG | Perion Network Ltd | Data Files | Magentic Download | Magentic | Perion Network Ltd |
| .NPL | Nokia | Data Files | Nokia Playlist File | Nokia Multimedia Player | Nokia |
| .NPM | Corel | Data Files | CorelDRAW V10 Draw Media Lines Data | CorelDRAW Graphics Suite | Corel |
| .NPO | Kostas lab | Data Files | Nonpareil Redundancy Summary File | Nonpareil | Kostas lab |
| .NPS | Open Source | Data Files | Natron Node Presets File | Natron | Open Source |
| .NPT | Extensis | Data Files | Portfolio NetPublish Pre-cursor Template File | Portfolio | Extensis |
| .NPZ | INCA Internet | Data Files | GameGuard Update File | GameGuard | INCA Internet |
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