Originally Posted by Igo kyu (Post 330896)

This is very probably mistaken.

If the devs used the sizes of variables in any of a thousand ways that they could, then changing from 32 bit to 64 bit could cause problems. It doesn't have to, if the devs were scrupulous about not using the sizes of the variables it all might just work, but if they used any of the possible optimisations that depend on the sizes of variables, then it will probably be a very long job to make a 64 bit version of the game.

Obviously, I don't know how the devs made the game, but if there were almost any optimisations at all, then simply recompiling it for 64 bit would probably break the code. You'd get error reports from the compiler about what broke where, but sorting that out is typically tricky, because what seems to be broken there is often connected to something that doesn't seem broken here, and that's connected to something else somewhere else, and so on and so on. Eventually you sort out all the connections, but that might be months later. Feeding random code to the compiler and chasing the errors it gives you is probably not the most efficient way of working.