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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .N1E | OM2 Services LLC | Text Files | OM2 OMALI NENA Encrypted Document Version 1 | OM2 OMALI Professional | OM2 Services LLC |
| .N3 | Sublime HQ Pty Ltd | Text Files | Notation3 Document | Notepad++ | Don Ho |
| .NB | Wolfram Research | Text Files | Mathematica Notebook | Wolfram Research Mathematica | Wolfram Research |
| .NCZ | Netcad | Text Files | Netcad Drawing | Netcad | Netcad |
| .NE2 | OM2 Services LLC | Text Files | OM2 OMALI NENA Document Version 2 | OM2 OMALI Professional | OM2 Services LLC |
| .NFD | Nefsis | Text Files | Nefsis Document | Nefsis | Nefsis |
| .NFO | Microsoft Corporation | Text Files | System Information File | Microsoft System Information | Microsoft Corporation |
| .NLC | Nero AG | Text Files | Nero Linux Compilation File | Nero Linux | Nero AG |
| .NOTE | Failsafe Games | Text Files | Notessimo Composition | Notessimo | Starburst |
| .NOTES | Guyswithtowels | Text Files | Memento Notes File | Memento | Guyswithtowels |
| .NOW | The Document Foundation | Text Files | Readme Text Document File | LibreOffice | The Document Foundation |
| .NPD | Netrosoft Corporation | Text Files | Netrosoft Presentation Document | Netrosoft Office Suite | Netrosoft Corporation |
| .NPL | Nokia | Text Files | Nokia Playlist File | Nokia Multimedia Player | Nokia |
| .NRF | The Neat Company | Text Files | Neat Document Folder File | Neat | The Neat Company |
| .NTG | Mark Milam | Text Files | NTGsim Data | NTGsim | Mark Milam |
| .NWM | Sony | Text Files | Sony NWM Display Screen File | Adobe Photoshop | Adobe Systems Incorporated |
| .NWP | Perion Network Ltd | Text Files | Magentic Wallpaper File | IncrediMail | Perion Network Ltd |
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