I'm using Crystal Reports XI and would like to join two excel 2003 (.xls) database files with a full outer join. Unfortunately, that join type is grayed out. I have learned that there is a work-around to this if you add a command in "database expert" but every time I try, I get a "DAO Error Code: 0xc3b"

Does anyone have any ideas? How can I achieve a full outer join?