How to unzip the X-server *.bz2

[Chung Ming Chan]

Hi,
     It is a very simple question. I just down loaded
"cygwin-xfree-x11r6.4-cygwin-B20.1.tar.bz2" to my PC and winzip can't unzip the
file.
Not sure what tool to use to unzip *.bz2 files.

Thanks,
ming