How to run MFC Samples

[Captrick458]

I have downloaded a sample from MS. The directions state:

To build and run the CMNCTRL2 sample

Open the solution cmnctrl2.sln.
On the Build menu, click Build.
On the Debug menu, click Start Without Debugging.

If I open cmnctrl2.sln as a file, then Build is disabled, and it won't open as a project. What am I missing?

Thanks in advance, Rick