Have you just tried just unzipping your epub to get to those files:
1. create a folder on your Desktop called junk
2. your epub to your Desktop into the junk folder you just created
3. In Terminal.app run the following commands:
cd
cd Desktop
cd junk
unzip YOUR_EPUB_FILE_NAME_HERE
then exit out of Terminal.app and go to the unpacked epub inside the junk folder and look for your iTunesArtWorkfile.
My test epub is copyrighted. I will create an even simpler one with non-copyright files tomorrow and post it if the above does not work.
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