l4d 2 sounds?

how do extract the sounds/music from l4d/2 from the gcf?
i get in it and double click it and i get


Error writing C:\Users
ame\AppData\Local\Temp\clingingtohellhit1.wav (Error: NCF files are indexes and do not contain any file data.)

error
so how do i do this

You need to extract it from the vpk in the common folder

This has to do with garrysmod.org

thanks i’ll try that