Quote:
Originally Posted by PeterT
Actually one OTHER concern is that Kobo do store the size of the book in the database; if a change is made to the copy ON THE device then unpredictable things DO happen. (AT least I can't remember exactly what they are, but I knopw they are not desired; I'm sure that once Davidfor is awake, he will chime in with details).
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I've been bitten by this problem before I knew better. The Kobo will delete the book after disconnecting if you make an on-device change. I can't remember if it's a change in filesize or file timestamp (or both?) which does the damage. Either way, it's best avoided
Opening with 7-zip or WinRar is OK as long as you quit without changing anything.
A semi-related warning: if you have checked the box 'Update metadata embedded in book when opening' in Editor
Edit - Prefs - Integration with calibre, then be aware that if you open an epub from within calibre the epub's opf file will be updated and saved even if you File- Quit without saving. If you want File-Quit to mean 'Quit and don't change anything', you need to uncheck that box. The default is checked (or at least it used to be).