Failed to load mda_sap.dll when defining connectng BW & BOBJ Designer

Dear BOBJ and SAP Experts,

The following error message occurs when defining a SAP Client connection in BOBJ Designer:

"DBD: An error occurred while trying to load the provider for transport sap. Failed to load library mda_sap. System error message: The specified module could not be found."

We are running BOBJ on a Windows Server 2003 R3 64bit server. The mda_sap.dll file exists in folder: C:\Program Files (x86)\Business Objects\BusinessObjects Enterprise 12.0\win32_x86

Please help!

Thanks,

Arwel.