User DSN: HKCU\Software\ODBC\ODBC.INI System DSN: HKLM\Software\ODBC\ODBC.INI File DSN: Query the value of HKLM\Software\ODBC\ODBC.INI\ODBC File DSN\DefaultDSNDir and check the directory for DSN files.P/S: I have never tried this before as I am doing DSN-less connection.