Problem on string types

I exported my CE 6 SDK and installed it on VS 2005.
I have this problem when I try to compile projects based on my SDK: when it has to link funcions from my CE 6 library that use LPCTSTR type, it doesn't work.
I read about the different types of string in Windows, but I didn't find a way to convert a simple char * to a LPCTSTR type. This last is only a way to solve the problem, perhaps there's also a way to use LPCTSTR types directly within VS 2005 projects.