Noob question here. How exactly do I get the .dem files to play? When I go to open them, it auto chooses steam, but then gives me an error when I go to open it. Error reads "Setup file 'gameinfo.txt' doesn't exist in subdirectory 'hl2'. Check your -game parameter or VCONFIG setting." No idea what that means. Am I actually missing something, don't have a correct app, or just a setting I missed somewhere? Any help much appreciated.