It sounds like the documents are damaged internally. Do you have an
installation of 2003 (or another version of Word) where you can try to open
them? If you do, and they open successfully, try saving them to XML file
format (if 2003) or HTML format (if 2002 or 2000) or RTF format (if 97). With
any luck, that will clean out the "gunk" so that Word 2007 can recognize them
correctly.
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