Quote:
Originally Posted by theducks
The one that HAS been set (the always use tick box in Open With properties) in the OS.

Double click on a PDF in Explorer... What opens the file, is what Calibre will use.
Don't want Calibre to use that one? Get and configure the 'Open With' plugin to choose the one you want.
  you can add lines so there is an entry choice for each that you have:
A PDF
B PDF
C PDF
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Actually couple times Calibre messed up my viewer settings under Linux (installed it via Debian packages I think). Calibre became my default pdf viewer which was a terrible experience. I could not get rid of it, I tried every possible way under Linux to change it. I ended up wiping Calibre from the sytem and using manual zip method.