Hi,
That behaviour is determined by the ebook itself. If it is a Topaz ebook then and only then do you end up with a non-mobi file. Actually reading the FAQ at the AA site explains these things.
Quote:
Originally Posted by SkyDream
Using the tools from Apprentice Alf on books from Amazon results in mobe files MOST of the times. Unfortunately sometimes you got HTMLZ files instead of mobi ones. I don't know the reason behind that behaviour but i assume it's not calibre but the converter from Apprentice Alf that's responsible for it. Assuming he didn't use some sort of random device the root cause must be the format of the book itself. There's nothing you or calibre can do about that.
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