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Open the file in InDesign CC, then go File -> Save As or File -> Export and choose the file type IDML. You will then be able to open that IDML file in CS6 If you don't have access to InDesign, there is a service that can help: www.stokesdesignproject.com/down-save-indesign-file-service.php
It looks like some of the characters in your file name are being turned into their unicode representation. For example, the character '3' in unicode is '\x33', and your corrupt file name shows'x33'. Also, '(' in unicode is '\x28', etc, etc. This seems to not be coincidental. I don't know what operating system you are running, but maybe you can check ...
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