Exactly what the title says, I just picked up modding again (used to mod quite a bit with Fallout 3 and New Vegas), and I've forgotten pretty much everything about the Creation Kit.

I messed around for a few hours and things slowly came back to me, and my friend asked me to make a custom bow with a custom sound. I got through the custom weapon part pretty easily, but I cannot figure out how to add the audio. I've converted the sound from .mp3 to .xwm, but I don't know where to place it so it shows up as a choice under Attack Sound in the creation kit.

So, to put it simply, I just need to know where to put the audio file so that it will show up as an option under Attack Sound in the Creation Kit.

I've never done this, but just by looking at the CK, you would probably have to create a new http://www.creationkit.com/Sound_Descriptor