1: Open My Computer>Local Disk>Program Files>Maiet>GunZ>Sound.
2: Right Click and copy bgm.mrs, paste it in My Computer>Local Disk>Documents and Settings> (Whatever the name is to when you login to your computer)> PASTE IN HERE!
3: Put the attachments in that folder.
4: Top-left corner of your screen press start, then somewhere there it says "RUN", CLICK THAT!
5: Type in cmd, then click "OK", something should pop-up. Type "decompile" in there.
6: A file named "bgm should come in the folder. Open it, then open any of the sounds that you would like.
7: Get your own music then rename it to the one that you wanna replace. e.g. I wanted to change lobby music, I would call it Theme Rock(D).ogg. Replace the file in there with the one you want.
8: Close folder, go back to cmd and type in compile. Take the one that says 1kb under it finally then replace the one in My Computer>Local Disk>Program Files>Maiet>GunZ>Sound!
9: DONE!!!!!!!!!
EDIT: FILES CORRUPTED