v7.8.4 disappeared from Settings
FYI only - On 9 Feb 2020, after installing update v7.8.4, Notepad++ stopped being the default for .TXT files and disappeared entirely from (Windows10) Settings…therefore the default could not be reset from there. Right-clicking and selecting More apps, etc. and checking the Always use this app checkbox did reset the default and caused Notepad++ to reappear in Settings.
See three options for editing the context menu for Notepad ++.