I recently activated my 2007 physical copy of Supreme Commander on Steam that has been installed via disk since that time. It gave me access to Supreme Commander AND Forged Alliance (yay free game! :D) but according to Steam I have to re-download and re-install SupCom, even though it is already installed.
Is there a way to move the original game files around such that Steam knows it's installed? Yes, I know I can uninstall the already installed copy and re-download it but I'd like to avoid that if I can.