Got it, I found out my problem was I was downloading the LUA file from opening it in a chrome tab, instead of right clicking on your link and saving-as. Thanks!
EDIT: Thought I'd include this, I printed it out and have found it very useful! I mapped out all of your keys to a high-res PNG image of the joystick.
http://dl.dropbox.com/u/1125473/extreme3dpro_DCS.png
screenshot example