While the new VSLangProj90.dll contains new automation enums such as
VSLangProj90.prjOptionInfer and interfaces such as VBProjectProperties4, the
interfaces are empty, despite there are new properties in Visual Studio that
apply only to the version 2008, such as "OptionInfer" or "TargetFramework".
These properties appear when iterating the EnvDTE.Project.Properties collection but do not
appear in the VBProjectProperties4 interface.