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The mimetype must be the first file and it must not be compressed. Usually it is so small it is won't compress. Make a zip with only mimetype in it and then add the others to the already created zip file. You said you were trying different compression settings so the mimetype would be 0. The idea is that you could view the contents of the file without uncompressing it and still be able to see the mimetype. This is a requirement of the standard. All of the various ePub check programs test for this, by the way.
Dale
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