Quote:
Originally Posted by unko
By the way, I didn't toggle the PDF option under Preferences>Behavior for internal viewing, so I'm really at a loss.
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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.
BR