What are you asking? Which program or which syntax highlighting option?
He's using Sublime text 2 and obviously the sytax highlighting is Lua.
You can also use Notepad++
I recommend Notepad++ since it's alot smoother and user friendly in my opinion and much like regular notepad so you will already be familiar with it.
http://notepad-plus-plus.org/
http://www.sublimetext.com/2