Help with decompiling .group.bin files

[yunes-0840]

I'm having issue trying to extract the game's audio files, problem is: I wanted to get the audio file of the sim saying "pussy whips".
I have come to your documentation about this game in the searching, however, while trying to decompile sound_main.group.bin, lz4 says to me that there is no header.

Thank you for your time.
Have a nice day.
Yours truly, Yunes.
-Peach