Unable to Unpack .PUP file

Commerce Portal. I am unable to unpack CommercePortal.pup file. What are the required files / executable for this to be executed ? I mean what are the supporting files required to unpack this .pup file ?

If you have MS Commerce Portal installed, the Package and deploy wizard for Commerce Portal will handle unpacking and repacking sites. This progran should be associated with the .pup extension upen installation.