Comparing Word files

i have two word document files 1 and 2 in which
some text is written
i want to compare these words files(character by chracter)
and the result(difference) will stored in another word file 3.
so that at the last 3rd file contains the text of both first and 2nd file
and there difference is highlighted that following things are in 2nd file

and not in ist file
Using VB 6.0
any helping material will also be appriciated

Hi,
I would like to share my opinion about another interesting program that may be useful for you: Compare Suite (www.comparesuite.com). The program compares not only word documents but also *.txt, *xls, *.html, *.pdf etc. files. Other useful feature is folder comparison
The comparison process runs fast, no crashes etc. So I think I will not be looking for some other comparison software.