| .NFS | Codemasters | Gegevensbestanden | F1 2015 Speech Data | F1 2015 | Codemasters |
| .NFT | NetObjects | Gegevensbestanden | NetObjects Fusion System Data | NetObjects Fusion | NetObjects |
| .NFX | NetObjects | Gegevensbestanden | NetObjects Fusion Components Bbscomp Data | NetObjects Fusion | NetObjects |
| .NG | Symantec Corporation | Gegevensbestanden | Norton Guide Online Documentation Database | Norton Desktop | Symantec Corporation |
| .NGD | Xilinx, Inc. | Gegevensbestanden | Xilinx Netlist File | ISE Design Suite | Xilinx, Inc. |
| .NGE | Nexus Group | Gegevensbestanden | NeXus Personal Security Client Data | neXus Personal Security Client | Nexus Group |
| .NGG | Nokia | Gegevensbestanden | Nokia Group Graphics Image Format File | Nokia phones | Nokia |
| .NGR | NEPLAN AG | Gegevensbestanden | NEPLAN Graphic Data | NEPLAN Electricity | NEPLAN AG |
| .NGS | 5pb. and Nitroplus | Gegevensbestanden | Steins;Gate Game File | Steins;Gate | 5pb. and Nitroplus |
| .NHF | Nero AG | Gegevensbestanden | Nero HFS CD Compilation | Nero Burning ROM | Nero AG |
| .NHM | Microsoft Corporation | Gegevensbestanden | Microsoft Systems Management Server (SMS) Data | Microsoft Systems Management Server | Microsoft Corporation |
| .NI | NetObjects | Gegevensbestanden | Netobjects Fusion Preview File | NetObjects Fusion | NetObjects |
| .NICNT | Native Instruments | Gegevensbestanden | Native Instruments KONTAKT Library | Native Instruments Kontakt | Native Instruments |
| .NICRASH | Native Instruments | Gegevensbestanden | TRAKTOR Crash Report | Traktor | Native Instruments |
| .NID | Nikon | Gegevensbestanden | Nikon Capture IPTC Data | Nikon Capture NX | Nikon |
| .NIF | Gamebase | Gegevensbestanden | Gamebryo Model File | Gamebryo | Gamebase |
| .NII | Unknown Developer | Gegevensbestanden | NIfTI-1 Data Format | Unknown Software | Unknown Developer |
| .NIL | Symantec Corporation | Gegevensbestanden | Norton Icon Library Icon Set | Norton Utilities | Symantec Corporation |
| .NIR | Flexera Software | Gegevensbestanden | AdminStudio Repackaging Wizard Output | AdminStudio | Flexera Software |
| .NITF | U.S. Department of Defense | Gegevensbestanden | National Imagery Transmission Format File | GDAL | Open Source |
| .NIV | Open Source | Gegevensbestanden | TheWord New International Version Module | theWord | Costas stergiou |
| .NIX | IBM | Gegevensbestanden | Rational XDE Data | Rational Rose | IBM |
| .NKI | Native Instruments | Gegevensbestanden | KONTAKT Instrument File | Native Instruments Kontakt | Native Instruments |
| .NKR | Native Instruments | Gegevensbestanden | KONTAKT Resource Container | Native Instruments Kontakt | Native Instruments |
| .NKY | NUM | Gegevensbestanden | NUMROTOplus Keyfile | NUMROTOplus | NUM |
| .NL | Kdan Mobile Software Ltd | Gegevensbestanden | Note Ledge File | NoteLedge | Kdan Mobile Software Ltd |
| .NLB | Oracle Corporation | Gegevensbestanden | Oracle Locale Builder Binary File | Oracle Locale Builder | Oracle Corporation |
| .NLF | ClickTracks Analytics, Inc | Gegevensbestanden | ClickTracks Normalized Log | ClickTracks | ClickTracks Analytics, Inc |
| .NLO | IBM | Gegevensbestanden | Lotus Notes Linked Object | IBM Lotus Notes | IBM |
| .NLP | NirSoft | Gegevensbestanden | NirLauncher Package | NirLauncher | NirSoft |
| .NLR | Phillip H. Sherrod | Gegevensbestanden | NLREG Nonlinear Regression Control File | NLREG | Phillip H. Sherrod |
| .NLS | Uri Wilensky | Gegevensbestanden | NetLogo Source Code File | MacroMates TextMate | MacroMates |
| .NMA | National Marine Electronics Association (NMEA) | Gegevensbestanden | NMEA Data File | GPSBabel | Open Source |
| .NMEA | Interscape | Gegevensbestanden | NMEA GPS Data File | NMEA to KML Converter | Interscape |
| .NMI | StudyLamp Software | Gegevensbestanden | SwordSearcher Data | SwordSearcher | StudyLamp Software |
| .NML | Native Instruments | Gegevensbestanden | Traktor Collection File | Traktor | Native Instruments |
| .NMO | Dassault Systèmes | Gegevensbestanden | 3DVIA Virtools Behavioral Object File | 3DVIA Virtools | Dassault Systèmes |
| .NMV | Open Source | Gegevensbestanden | Nintendulator Movie Capture File | Nintendulator | Open Source |
| .NMW | Microsoft Corporation | Gegevensbestanden | Microsoft NetMeeting T126_Whiteboard File Format | Microsoft NetMeeting | Microsoft Corporation |
| .NND | CYME International | Gegevensbestanden | CYMFLOW Network Data | CYMFLOW | CYME International |
| .NNG | Pioneer DJ Corporation | Gegevensbestanden | Pioneer AVIC Navigation Unit Data | Unknown Software | Unknown Developer |
| .NNI | Oolution Technologies | Gegevensbestanden | ANNI Information File | ANNI SOFTWARE | Oolution Technologies |
| .NNP | Oolution Technologies | Gegevensbestanden | ANNI Neural Network Portfolio Data | ANNI SOFTWARE | Oolution Technologies |
| .NNVS | NextNine Ltd. | Gegevensbestanden | NextNine VNC Player VNC Session File | NextNine VNC player | NextNine Ltd. |
| .NOM | PTC | Gegevensbestanden | Aonix Nomad File | Nomad Software | PTC |
| .NORMAL | Apple | Gegevensbestanden | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .NOT | Notation Software | Gegevensbestanden | Notation File | Notation Musician | Notation Software |
| .NOTEBOOK | SMART Technologies | Gegevensbestanden | SMART Notebook File | MimioStudio | Mimio |
| .NOTEPAD | Apple | Gegevensbestanden | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .NP | Extensis | Gegevensbestanden | Portfolio NetPublish File | Portfolio | Extensis |
| .NPA | 5pb. and Nitroplus | Gegevensbestanden | Steins;Gate Archive File | Steins;Gate | 5pb. and Nitroplus |
| .NPD | Netrosoft Corporation | Gegevensbestanden | Netrosoft Presentation Document | Netrosoft Office Suite | Netrosoft Corporation |
| .NPG | Perion Network Ltd | Gegevensbestanden | Magentic Download | Magentic | Perion Network Ltd |
| .NPL | Nokia | Gegevensbestanden | Nokia Playlist File | Nokia Multimedia Player | Nokia |
| .NPM | Corel | Gegevensbestanden | CorelDRAW V10 Draw Media Lines Data | CorelDRAW Graphics Suite | Corel |
| .NPO | Kostas lab | Gegevensbestanden | Nonpareil Redundancy Summary File | Nonpareil | Kostas lab |
| .NPS | Open Source | Gegevensbestanden | Natron Node Presets File | Natron | Open Source |
| .NPT | Extensis | Gegevensbestanden | Portfolio NetPublish Pre-cursor Template File | Portfolio | Extensis |
| .NPZ | INCA Internet | Gegevensbestanden | GameGuard Update File | GameGuard | INCA Internet |
| .NRC | Nero AG | Gegevensbestanden | Nero Disc Compilation File | Nero Burning ROM | Nero AG |
| .NRD | Nero AG | Gegevensbestanden | Nero Burning ROM DVD-Video Compilation | Nero 2017 | Nero AG |
| .NRE | Nero AG | Gegevensbestanden | Nero Burning ROM CD EXTRA Compilation File | Nero Burning ROM | Nero AG |
| .NRF | The Neat Company | Gegevensbestanden | Neat Document Folder File | Neat | The Neat Company |
| .NRJ | Nero AG | Gegevensbestanden | Nero JukeBox Compilation File | Nero Multimedia Suite | Nero AG |
| .NRL | Autonomy Interwoven, Inc. | Gegevensbestanden | Autonomy Interwoven Link File | iManage Worksite | iManage |
| .NRM | Nero AG | Gegevensbestanden | Nero Mixed Mode CD Compilation | Nero 2018 | Nero AG |
| .NRP | e.World Technology Limited | Gegevensbestanden | ASP.NET Report Maker Report | ASP.NET Report Maker | e.World Technology Limited |
| .NRT | Nokia | Gegevensbestanden | Nokia Ringtone | Nokia Suite | Nokia |
| .NRU | Nero AG | Gegevensbestanden | Nero UDF CD-ROM Compilation | Nero 2018 | Nero AG |
| .NSB | NS Basic | Gegevensbestanden | NS Basic/CE Data | Unknown Software | Unknown Developer |
| .NSG | IBM | Gegevensbestanden | Lotus Notes Database | IBM Lotus Notes | IBM |
| .NSQ | Qlik | Gegevensbestanden | NScheduler Qlikview Data File | Qlik NPrinting | Qlik |
| .NSR | Tenable | Gegevensbestanden | Nessus Security Report File | Nessus | Tenable |
| .NST | Microsoft Corporation | Gegevensbestanden | Outlook Connector For Notes File | Microsoft Outlook | Microsoft Corporation |
| .NSX | NS Basic | Gegevensbestanden | AppStudio Project | NS Basic AppStudio | NS Basic |
| .NT | Microsoft Corporation | Gegevensbestanden | Windows NT Startup File | Microsoft Windows | Microsoft Corporation |
| .NT0 | Unknown Developer | Gegevensbestanden | Adressmn File | Unknown Software | Unknown Developer |
| .NT3 | Unknown Developer | Gegevensbestanden | Adressmn File | Unknown Software | Unknown Developer |
| .NTD | NinjaTrader LLC | Gegevensbestanden | NinjaTrader Database | Ninja Trader | NinjaTrader LLC |
| .NTF | Open Source | Gegevensbestanden | Windows Font File | Microsoft Windows | Microsoft Corporation |
| .NTG | Mark Milam | Gegevensbestanden | NTGsim Data | NTGsim | Mark Milam |
| .NTO | Beyond Security | Gegevensbestanden | NTOScanner Data | NTOScanner | Beyond Security |
| .NTR | Open Source | Gegevensbestanden | Netrun Executable List | NetRun | Open Source |
| .NTS | IBM | Gegevensbestanden | Lotus Notes Traveler Server Config File | IBM Notes Traveler | IBM |
| .NTX | Open Source | Gegevensbestanden | TheWord Encrypted New Testament Text | theWord | Costas stergiou |
| .NTZ | NetZ Computing Ltd. Israel | Gegevensbestanden | InVircible Antivirus Directory Integrity Information | InVircible | NetZ Computing Ltd. Israel |
| .NUB | Xerox | Gegevensbestanden | Xerox FreeFlow NUB Init Data | FreeFlow | Xerox |
| .NUG | Nuggets Unlimited | Gegevensbestanden | Nugthat Player File | Nugthat Player | Nuggets Unlimited |
| .NUGG | SAP | Gegevensbestanden | SAP Generated Nugg Data | SAP ERP | SAP |
| .NUWAGE | Apple | Gegevensbestanden | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .NVC | Nero AG | Gegevensbestanden | NeroVision Express Project File | Nero Video 2017 | Nero AG |
| .NVD | Savannah | Gegevensbestanden | Navidoc Data | Navidoc | Savannah |
| .NVI | NVIDIA | Gegevensbestanden | NVIDIA Driver File | NVIDIA Graphics Driver | NVIDIA |
| .NVL | Interscape | Gegevensbestanden | UniChem Results File | Oxford Molecular UniChem | Interscape |
| .NVM | Open Source | Gegevensbestanden | PlayStation 2 BIOS Configuration File | PCSX2 | Open Source |
| .NVR | National Creative Registry | Gegevensbestanden | NeverForget Data File | NeverForget | National Creative Registry |
| .NVT | Neuralynx | Gegevensbestanden | NeuraLynx Video Tracker Data | Video Tracker File Playback | Neuralynx |
| .NW | GitHub, Inc. | Gegevensbestanden | Node-Webkit App Package | NW.js | GitHub, Inc. |
| .NW4 | Novell, Inc. | Gegevensbestanden | Netware.4x File | NetWare 4.1 | Novell, Inc. |
| .NWP | Perion Network Ltd | Gegevensbestanden | Magentic Wallpaper File | IncrediMail | Perion Network Ltd |
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