This is a fix to the recent error with the WorldServer.exe. FATAL Error, with the range function.
As always, scan this file if your unsure if it's safe. Use virustotal.com. Viruschief is not reliable.
EDIT:Once you download this file, just put it in your server folder where you have your other .exe's(Login Server.exe, Character Server.exe, World Server.exe).
Overwrite the existing Worldserver.exe in that folder. Then you shouldn't get the Fatal Error anymore.