Visual Studio 7.0 and the platform value is Custom.
Our projects contain additional include directories in the Visual Studio IDE C++ project configuration pages and these are specified with environment variables (so the SDK's can be located in different places on different people's machines).
Visual Assist (the old version and the new X version) only picks up on these SDK's if we forceably add them to your VA Project directories - ie. it is not picking up on the Visual Studio per-project C++ additional include directories with environment variables.