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It would seem to require a completely new format that supports both audio and graphics. All the audio books I know of are either .mp3 or the audible.com special format. You need a way to insert the display of the graphics at a specific point in the playing of the audio. There is no good way to synchronize the display from 2 different files. If the encoding was changed (bit rate or type), if you used some byte offset in the file for the graphics reference, it would not work if you changed bit rates, for example.
You would probably have to get new contracts with the rights owners, hire voice actors to read the books, etc. This might be doable for a company already in that business, but for a private person, almost impossible.
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