Why are you using cmd? Did you use a time machine to go back to the 90's?
Copy the folder normally, and then go into your B.net client and change the path to your game:

Sorry citizen of Programmer's Haven, for I have sinned, I have helped this dude who came into Programmer's Haven about an issue completely unrelated to Programming.
This post was edited by Eagl3s1ght on Nov 27 2013 03:01pm