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As for the OP's question, which was actually how to recover a corrupted epub file.
@Toreth: An EPUB file is really just a ZIP file.
The error indicates that the underlying ZIP file itself was corrupted. calibre tries hard to recover from common forms of zip file corruption, so if calibre cannot open it, you are probably out of luck.
One thing you can do is try to open it in WinZip (which has even more workarounds for zip file corruption). If it can repair the ZIP file you should then be able to open it in other programs.
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