Is Diablo 3 open for mods?
I'm wondering if Diablo 3 is open to the creation of mods/custom maps?
Not if Blizzard is supporting it, but do the game files have hooks and stuff that a mod could hook on?
No, Blizzard said they have no official support for modifying the game, and doing that yourself is against the Terms of Service and could lead to your account getting removed.
In addition, because of the client-server nature of the game, there is a severe limitation on what one can change anyway.