the double click is windows, not calibre setting I think. doubel click anywhere on the book description line and if that format is not set to open with calibre internal viewer, then calibre uses windows to open with default program.
If I do that double click with a book that's in 2 formats: azw3 and epub, then it opens only in sigil, so calibre's sorted list of preferred formats must also contribute
if I double click a title that is azw3 only, then it opens in Kindle for PC...
so how do I get to the new built-in open with settigns, I tried a quick blunder around the preferences screens but managed not to bump into it ?
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