Anyone could replace these files to change the soundtrack however they pleased (locally only, of course). When the feature was first launched, the audio files for all music kits were just sitting out in CS:GO's install directory. I don't think I'm the only one who has wished for music kits from different artists to be included in the game. However, there aren't that many to choose from. Being able to personalize the game's soundtrack is a fun and unique feature. Gee, I sure hope my app is ready for prime-time.