Are we talking about:
1) the "Go to cover" functionality from within the book when reading it in K4PC?
Or:
2) the cover thumbnail-image that shows when browsing your K4PC library?
There is no solution for number 2. More recent versions of K4PC simply don't use the ebook file for finding/displaying those thumbnail-images anymore. Sideloaded content will always show the default blue-book-with-bookmark-sticking-out for its cover thumbnail in the library view.
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