Dead or Alive Dimensions sounds (.ssw)

[sheikproject]

Hello, i want to extract the music and sounds from the .ssw files. I open it in a hex editor and i see that it uses the .xws compression and some mention of the .wav music compression.
I include also .sso if is necessary.

bgm.sso: http://www.mediafire.com/file/ds75g277nw76pkq/file

bgm.ssw: http://www.mediafire.com/file/ze6tei8cbz5n1cq/file