unformat word document w/ equation

I need to unformat a document created with Word 2000 that contains an object generated with Microsoft's Equation Editor. Everything seems to work fine, but after unformatting, I can't open the resulting rtf-file. As soon as I remove the equation object before unformatting, there is no problem at all.
Thanks, Volker

Volker, can you email me the

Volker, can you email me the document before and after the formatting. Please also zip your database folder and let me know which style was used. Thanks, Paul