[SPOILER] How to make the Wind Open's a Door!

[Adrianis]

And...

{
AddEntityCollideCallback("Player", "area1", "Open_Door", true, 1);
}

... that really needs a function header, which JustAnotherPlayer pointed out (but you didn't follow )

void OnStart()
{
AddEntityCollideCallback("Player", "area1", "Open_Door", true, 1);
}