A-ray worked for Tiberium Sun, however not for the Original Command and Conquer game. The game is so old I am wondering if there's no copy protection aside from a simple CD check...lol.
That is basically the only game I can think of that I have that no protection has been found...although ClonyXXL gave it 5 skulls in difficulty even though it couldnt find a protection.

My original Red Alert sadly wont run on XP so I won't know about it unless I buy a newer version of the game.