Quote:
Originally Posted by BetterRed
I'm not sure what calibre does if a format (PDF, TXT etc) doesn't have a default viewer specified at the OS level and the format is unchecked in the Preferences->Behaviour->Use internal viewer for
Try this - right click on PDF in Book Details and select Open PDF with, if there's nothing there, add a suitable program such as muPDF.
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BR
I believe the OS does just what it would if you had double-clicked a file in Explore: Ask you what App do you want to use.