The Old New Thing

What is the story of the mysterious DS_RECURSE dialog style?

There are a few references to the dialog style scattered throughout MSDN, and they are all of the form "Don't use it." But if you look in your copy of , there is no sign of anywhere. This obviously makes it trivial to avoid using it because you couldn't use it even if you wanted it, seeing as it doesn't exist. "Do not push the red button on...