Thank you both!
@theducks:
Quote:
Originally Posted by theducks
Ctrl-o with the book selected:
then right-click the file: Open With... (this is the OS file managers O/W  )
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There is no action at clicking Ctrl + o, thus no way to right-click.
No, it is not. I can easily open it in Sigil directly, going to Calibre's library.
Quote:
FWIW, I use this PI frequently with Sigil.. It just runs.
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On my other Computer (also Win10 32-bit), it runs as well.
@BetterRed: Yes, this worked; I didnT know about this possibility. Would nevertheless like to know what strange error it was.