I took a look at it and couldn't get the xml doc to open. The cause of document corruption seen most often on these forums is related to use of USB drives or other external media. Did you store your document on a USB stick?

You may want to look at:
How to troubleshoot problems that occur when you start or use Word 2010, Word 2007, Word 2003, or Word 2002 - Microsoft Support
Document Corruption