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For all intensive purposes, your file is corrupted. You need to do some digging to figure out what encoding it was using if you have any hope of fixing it. In some cases there isn't much to be done except use manual find/replace in text editor. Especially for something which is already epub, as there is a good chance there the file is now using multiple encodings - UTF-8 plus whatever the original encoding was before the epub was created.
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