True and true. MTA has blocked game file modification since 1.0.3. Since all other versions (except older than MTA 1.0) still work with 1.0.3, though, you can just go to a lower version and still play with your edited files.
... In theory.
There are servers which block any version older than 1.0.3. Because of the edited game file check. Note that this check isn't there for nothing, though. It's blocked because any editing of your game files will give you a certain advantage, which is cheating, obviously.
So witch version should i get so i can play with handling lines and stuff