I read in both a Word Document (contains english and simplified chinese) and a CSV Document (contains both english and simplified chinese).
I load the CSV intoa DataTable and WordDoc into a Document. Perform a merge, and the resultant Word Document's merged fields contain the english but not the simplified chinese.
Example Merge source line: 簡體字fname字,lname,125324252,Rex
the first field shows as : fname
The original simplified chinese in the word document remains unchanged as expected.