Do
not ask Kilmatead - like any Templar worth his faded footprints in the sands of the Holy Land, he hates everything that's new, shiny, and popularised by nothing but propaganda.
Uninstall 7zNSE and reinstall it, then you have to follow the menu-instructions outlined in
this post/rant:
Kilmatead reluctantly wrote:...the message one does get (on Win10) is rather vague as it only says "go to Settings -> System -> Default Apps". It neglects to mention the extra steps of then selecting "Set defaults by app", finding "SevenZipFolder" in the list and clicking it, and finally selecting "Choose defaults for this program".
Win10 does not allow shortcuts to be given directly to the necessary menu items, and it also forces the user to select the associations they want
manually. It goes out of its way to prevent programmes from changing these settings, so automating the process is difficult and the menu browsing remains as Byzantine as ever.