Interesting questions about REZ modding
1. How do you open GMS files?
2. What happen if you mod the walls black?
3. What is inside the .delta files that nexon are using?

1. Can't
2. You'll have black walls in the game.
3. What the hell are delta files?
1) Don't know
2) Just Black Walls...
3) Only when there's an update files become .delta... Then they return .rez...You should try to save one while patching....If you can the attributes.rez...
We could find out something