Linux users can use wine, mac can use intel cpu and bootcamp. i do not like exe file idea though.
Exactly why don't you like the idea? You didn't even bother to explain yourself more clearly so people could actually consider your opinion. I can't picture anything negative that could come from the ZC developers making this. It could actually help advertise ZC around the internet more since most people don't play ZC quest because they can't get it to work, or don't want to download the whole program just to play a quest they are interested in. Its basically the same issue RPG Maker had.