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Originally Posted by stumped
? there must be some logic rules that govern all of that - and a flowchart or two ?
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Its complicated. For example, to create a thumbnail file on a kindle calibre needs CDETYPE and ASIN metadata to be present in the book file. These strings provide the association between the book and the thumbnail. Kindle books converted from an EPUB by calibre will probably have these values set, but those obtained from some other source may not.