simple solution
in Open With...below the list of suggested apps there will be an option to browse your pc for an app. take that and navigate to Sigil - I have it workign finr in window 1803 and windows 1809 on separate PCs
it can probably also be done in settings: default apps using set by protocol or set by file type but the above is easier
there is no need for risky registry edits.
PS I have a feeling that when sigil installs, it presents an option to associate with epub. so removing then clean installing sigil is yet another method
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