V8i series Bentley Map / OpenCities Map customizations may have utilized the 32 bit version of Bentley.Interop.MicroStationDGN.dll.

As of the CONNECT releases, only the current 64 bit version of Bentley.Interop.MicroStationDGN.dll is delivered. 

Customers wishing to port V8i customizations to CONNECT will need to revise them take advantage of the 64 bit dll.