Special characters in nicknames

How can I use special characters (e.g. [<]{>}|_) in my nickname?

Open your Default.ini file. Under the [Engine.Engine] header, find:

Language=eng

and change it to:

Language=int

Do the same thing for Swat4.ini & Swat4X.ini (if the two lines don't exist in Swat4(X).ini ignore this part).