makkancs
ASCII is essentially the English alphabet, punctuation and numbers, with Extended ASCII adding some, but not all, characters used in other European alphabets.
If any of your objects, sounds/music and other files in the game use characters that aren't in the English alphabet, then you might want to change them and see if it works.
I have no idea why this would be different between r239 and r244 unless you changed the name of something.