DSNLESS connection

Has anyone achieved a DSNLESS connection to Vantage 4 using VBA or
VB? If so, could you post the connection string you used? I get the
Progress Login box (to which I simply hit OK), then I get Run-time
error 3000, Reserved error -7778. Here is the code I'm attempting to
use, which fails:

tdf.Connect = "ODBC;DRIVER={MERANT 3.70 32-BIT
PROGRESS};DB=vantage;OIDP=TCP;OIDS=odbc40;OIDH=vantage;DBAM=Direct;DBP
R=TCP;DBPA=d:\epicor\vantage\db\;ASC=0;SR=1;GST=0;UID=;"