PDF X-Change Editor update switches defaiult PDF handler

[frustrated]

Every time Patch MY PC runs its scheduled weekly check and updates PDF-XChange Editor I discover that the default PDF app has been changed from the SumtraPDF to PDF-XChange Editor. I first thought it was PDF-XChange but its author assures me it is not their app that is doing the change. This only happens when PatchMYPC runs a check and finds that there is an update to the app and installs it. Using Windows10 Pro 22H2 here and PatchMY PC is 4.5.0.4