Hi All, I am trying to build a MIDI driver based on DDK sample. While building it is complaining about : "error LNK2001: unresolved external symbol _IID_IPowerNotify" "error LNK2001: unresolved external symbol _IID_IMusicTechnology" "error LNK2001: unresolved external symbol _IID_IMiniport" These GUIDs are defined in PortCls.h. I am adding Portcls.lib and Stdunk.lib for TARGET_LIBS but still I am getting these errors. Any ideas on what am I doing wrong here? cheers Neetu