Yes, the purpose of the manifest file is to tell windows to use Common Controls 6 if its available, regardless of what version then application was compiled with.
And regarding quwiltws comments, adding a manifest file to the IDE is a very bad idea. It actually changes the way the IDE serializes resources, so youll never know theres a problem when you open your solution on your computer, but as soon as you give it to someone without that manifest, they wont be able to read the serialized resources properly.