Is this the same principle for playing a game like Toonstruck? Or does this game work differently?

I have tried adding game but it says the game is unknown. I'm not so sure what to do from here.

Thank you!

I really am no good at this!

I'm pretty new to using this program and I've successfully got Discworld II and Monkey Island 3 working but I can't seem to figure out how I get both Sam & Max and Day of the Tentacle working. When I go to 'Add game' the names of the files are greyed out and I'm not sure how to add this game! Ca...