Cannot find interface "IMsRdpDrive" when using VS2008 (MFC class form typelib) to add an interface of mstscax.dll

Recently, I'm going to do a remote desktop software with C++.And I found its introduction in msdn,here is the address.

http://msdn.microsoft.com/en-us/library/aa383022(v=vs.85).aspx

So I use the mstscax.dll to complete this.But what is the problem is that by the way of adding MFC class form typelib I cannot find the interface IMsRdpDrive on list.

In another way of adding MFC class form ActiveX control,I found the interface I want. But,when I'm gonna add it to my project,there is an error "cannot find coclass for interface IMsRdpDrive".

What I want ask are the following 2 questions.

1.What is the difference of two way(MFC class from typelib and MFC class form activeX control)?

2.Why cannot find coclass for interface IMsRdpDrive?