This works for me. Current winetricks downloads from http://download.microsoft.com/download/4/a/a/4aafff19-9d21-4d35-ae81-02c48dcbbbff/MDAC_TYP.EXE which exists. Be sure you're using current winetricks; 20111115 should do, which you can get from http://winetricks.org/winetricks or svn.