If I were to have accidentally downloaded a .dmg file with Grim Fandango, would this play on Leopard?

Gee whiz, dunno if this is the right place to post, but here goes: Is or ain't Residual playable on Mac Os X 10.4.11? I soo wanna play Grim Fandango, but every time I open the Residual App it just closes. No big deal, as I'm awaiting Leopard by mail (yaiks!), but wanna make sure that it's the operat...