Hi,
I created a dot file (Word template) to convert Word document to WikiSyntax.
You can download it from:
http://fr.wikipedia.org/upload/d/de/Wikipedia52.dot
Sorry help only available in French at:
http://fr.wikipedia.org/wiki/Wikipédia:Macro_Word
I don't plane to make the WikiSyntax to Word version but it can be done
easily looking at the macros codes.
Hope it help.
Aoineko