K4PC doesn't always (if ever, any more) use the internal metadata cover-image for its library display. It downloads and stores a local copy of the cover image when purchasing/downloading Amazon content. I'll be honest... I don't know if it's possible any more to "roll your own" MOBIs and have K4PC display the cover. It seems as though it's tied to the official Amazon purchase/download process. Somebody might have figured out how to hack K4PCs db and get it to work, though.
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