How to open and view gla2 file, and this is the problem http://imgur.com/olvuIZ8 ?

I download apk file and obb file of a game. I extract obb file ass a zip. And inside have file call GLA2 file. I want to view data inside it but can't open as zip or text. How to view data in GLA2 file.? Never find any data about GLA2 file, even 1.