DSN less connection for MSAccess

Hi
I am opending the SQL database as below

Code:

BOOL bRet = m_DataBase.OpenEx(sDSNLESS, CDatabase::noOdbcDialog | CDatabase::openReadOnly );

I am supplying the connection string and it works good for SQL.

But, this is not working for MSAccess. Why? Is it not possible to open and access the MSAccess database like this?

Thanks
Anita Eugene