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By the way - I just discovered where the id from the number comes from (of course not all, just this special case):
valid epub file > kindlegen > mobi > add to calibre > convert to epub > tada!
Interestingly, such a converted epub file obviously does not want to cooperate with the kindlegen later, just because of the digits at the beginning of the id.
Maybe @kovidgoyal could change that, but he probably had a reason to do it that way.
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