You may apply guide from MS Corp. or alternative methods for restoring word data

https://www.openfiletool.com/docxopen.html DOCX Open File Tool
https://social.technet.microsoft.com...um=officeitpro
http://www.techrepublic.com/blog/10-...word-document/

You may try some additional methods to recover data from corrupt Word document.

Try Open Office: It has been seen that open office is able to open corrupt MS word document.
Search in Email: It may possible that you have mailed this document to someone previously. You may not recover your whole document through this method but something is better than nothing!