I think I know when this happened (could be wrong), and it is an interesting aspect.
There are other things we can tinker with using these types of files (as well as config files and others) that can be pretty cool to some users. You need to fall into the 'geek' status (at a minimum) to enjoy though. I'm more familiar with RB tricks like this, so I appreciate the heads up on a BiaB one.

Make your sound your own!
.. I do not work here, but the benefits are still awesome