This is also similar to Microsoft's XNA initiative which will manage resources and track them to see which ones are actually being used in the game or not. Often times in the past, games would ship out with much of the disk space taken up by unused content, which when gone unnoticed, also limited the amount of content game studios could put in their games.
Foul contraption. Bungie always had stuff in the code to look for. Heck Jason Jones even put secret messages in some games. This is heresy.