I see, I think I understand how I could implement this for my collection.
I've just realized though: the information about the "master format" seems to already be in the Calibre database! I've just tried this: a book imported in EPUB format, converted to MOBI by Calibre in order to upload it to my Kindle. When I select "Preview" in Calibre, Calibre opens the EPUB version of the book (visible because Calibre will update its reading position, thus the file date of the EPUB is changed). This is only a simple test of course, and my conclusion could be wrong. To phrase a question: how does Calibre determine which format to open for a "Preview" when a book has multiple formats?
I'm wondering: am I the only one slightly confused by how Calibre handles (auto-) conversions for a single book? I think I have an idea how this important functionality could be made more transparent to the user, though I'd like to have some more feedback from other users. Could be I'm the only one with this "issue", after all (; .
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