| .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 |
| .NWS | Microsoft Corporation | Gegevensbestanden | Windows Live Mail Newsgroup File | Microsoft Outlook Express | Microsoft Corporation |
| .NXL | Hancom, Inc. | Gegevensbestanden | HAANSOFT NEXCEL File | HAANSOFT NEXCEL | Hancom, Inc. |
| .NYM | Unknown Developer | Gegevensbestanden | Shefield Dictionary | Unknown Software | Unknown Developer |
| .NZL | Corel | Gegevensbestanden | Corel Painter Nozzle Data File | Corel Painter | Corel |
| .NZN | Conceptworld Corporation | Gegevensbestanden | NoteZilla | NoteZilla | Conceptworld Corporation |
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