Missing data source

[mythteller]

I just started doing some contract work for a non-profit. Mail merges
that used to work no longer do, apparently because the form letters
use a database that no longer exists as their data source. When I open
one of the letters, I get a dialog with the message "Word cannot find
its data source, <path>\<file>.mdb", where <path> is the *truncated*
path of the Access database. How can I discover the full path?

Thanks,
-- Aaron