MASM 8.0 in Visual C++ EE 2005

Hi guys,
I just installed MASM 8.0 for my Visual Studio, but when I open a project and add an .asm file it tries to compile it as C++.
So I wanted to change the build tool, but Microsoft Macro Assembler was not in the list of tools.
When I open a project which I downloaded from a site which contains the examples from my book( Assembly Language for Intel-based computers) it assembles correctly and the Microsoft Assembler is in the Tools list. Does anyone know how to add it to the Tools list for every project?

Thanks in advance

Appo

P.S. If anyone knows if you can install MASM 8.0 in Visual C++ EE 2008 and can tell me I would really be gratefull.