The files are not encrypted. They're compiled Lua files. The files you have are Lua bytecode binaries, much like Java bytecode binaries (but obviously in Lua and not Java). From the plain text I found in them when I poked around with this a few months ago, they appear to have something to do with the various multiplayer game types. Nothing too interesting... also, apparently impossible to decompile. I tried a couple Lua decompilers; no luck.