Right click and 'Save Link As' the link above. In Word, go to the Visual Basic Editor (Alt+F11) and do a File->Import of the attached file Word2Wacko.bas. If you import into Normal.dot then it will be available every time you start Word. Then just load your document and run the Word2Wiki macro. The text of the document is converted (in-place) and copied to the clipboard.
This utility is based on the work of swythan:
Word2Wiki