The File Extensions Database


.NU3 File Extension

  • Category: Backup Files

What is an .NU3 file?

.NU3 is Symantec Norton Utilities backup File

The nu3 file extension is associated with Symantec Norton Utilities.

The .NU3 files are used for backup purposes.


How to open:

Currently there is no specific information available, about how to open this file extension.For general information try to look at:Basic info how to open backup files

How to convert:

Currently there is no specific information available. For general information try to look at:Basic info how to convert backup files

How to solve problems with NU3 files

  • Associate the NU3 file extension with the correct application. On :
    Windows: Right click on any NU3 file and then click "Open with" > "Choose another app". Now select another program and check the box "Always use this app to open *.NU3 files". Mac: Right click (or Ctrl-click) the NU3 file, then click "Open with" > "Other...". Then choose another program and check the "Always Open With" box. Linux: Right click on the file, and select "Open with" and choose another program. iPhone: Tap the file. If you do not see an app to open the file, then tap Share "Share" and choose an app. Alternatively, save the file. Then open the Files app Files app. There long-press on the file, then release your finger. You will see a black menu bar. Then tap "Share" and select an app. Android: Tap the Settings icon on your smartphone, then tap on the Apps section. There tap the Options icon in the top right-hand corner of the screen to change the default apps.
  • Update your software that should actually open .NU3 is Symantec Norton Utilities backup File. Because only the current version supports the latest NU3 file format. Search, therefore, e.g. on the manufacturer website after an available .NU3 is Symantec Norton Utilities backup File update.
  • To make sure that your NU3 file is not corrupted or virus-infected, get the file again and scan it with antivirus software.