But if you must…
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Go into the Document Properties of Word and fill out all the little blanks in the SUMMARY tab. The Kindle will use whatever’s there to file your book on its shelf. Do you REALLY want to be filed as tmp_cfcaad[…]?
I didn’t think so.
*The best way to get sweet Kindle formatting is to format it (or have it formatted) in MOBI format and upload that to Amazon’s DTP.