how to get autohotkey default language

I have been working with AutoIt making small tools (autorecord with some adjustments mainly)  to save me keystrokes/mouse moes etc. during work. Now with a new computer tried several installs and even copy from my old computer but whatever I do: I am not able to have au3 syntax color or the compile buttons active to make my exe. I must be missing something very important. I have spread au3 property files in several directories but no luck.

Sorry it seems so stupied of me but I really don't know how to proceed.

thanks

Peter