Quote:
Originally Posted by cybmole
open (book on device) with sigil seemed to work OK though. I did not try saving any edits,
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Extremelly dangerous thing to do. Sigil automatically modifes your epub on loading. If by any chance you save that book even with no manual editing made, it will be in fact a modified version of it.
Nevertheless if you assume the implied risks you could launch the Calibre editor and then through Open book navigate to the device version of the book and open it. It would be risky but less than with Sigil as calibre editor does not perform any kind of modification on book opening and because through its Checkpoint system you do actually have a snapshot of the original opened book even if you did and saved real modifications on it.