High audio compression method!

[dead4now]

Recently i came across a dirt showdown repack by blackbox in my friend's pc.

The setup was just ~2gb and it decompressed to~9gb.

I noticed that they compressed all the audio files into ogg and then into rar......

I also noticed that they used some command line audio compressor like "sox.exe".

I was not able to find out how they did it.

the actual audio file was in [COLOR="rgb(46, 139, 87)"].WIP[/COLOR] format....

anybody got any comments..........

if that technique is known it will be great foe compressing audio files.....