I just tested an epub with com.apple.ibooks.display-options.xml in the META-INF folder with the Java version of epubcheck 1.1 and didn't get any error message.
Unless Lulu customized their version of epubcheck, chances are another file is unmanifested.
Maybe someone had a look at the images folder on a Windows machine and a hidden Thumbs.db file was added?
Last edited by Doitsu; 06-15-2012 at 07:40 AM.
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