What does it use the lua files for? I found it interesting when I read online that they use it.
closed as off topic by Trevor Powell, Sean Middleditch, Gajoo, Nick Wiggill, Maik Semder Jan 2 at 2:00
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First, we would appreciate a link to the original article so we would better know what you're talking about.
Second, Lua is a scripting language. It means you don't "hard code" behavior in your game, but rather use small programs (scripts) that the game reads and executes. This way you can separate the game mechanics (how something in particular will behave) from the game engine. It's useful for many reasons:
That's how new mods can be made after the game is finished. I very much doubt they used Lua to make the game. Unfortunately, without the link to the original article, I'm just talking common sense.