Before we proceed any further: where did you get WaW?I said in my first reply, my friend shared it to me on steam.
UGX Cabin worked for me and from my last time playing it, it uses a custom Main Menu.
Can you confirm UGX Cabin's folder is in the following folder:
One of the maps I tried to download is Ugx Cabin.
So I just got Cod Waw from my friend because he shared it to me on steam, I don't know if this has anything to do with it but when I launch a map, it just takes me to the Waw main menu. Can someone help me with this?