Hi,
I haven't managed to track it down. There's no Win32::Shell on cpan or backpan - according to
the Win32-GUI-1.06 FAQ (as of June 2001) it was available only as a ppm package from ActiveState. That was probably the case back in June 2001, but it seems ActiveState no longer provides that ppm package. (If they do, I couldn't find it.)
Presumably there's a recommendation as an alternative to Win32::Shell, but I don't know what that recommendation would be. Perhaps if you start a new thread here titled (something like) "What happened to Win32::Shell", you might attract the attention of someone who knows a bit more about it.
Or, you could post to the perl-win32-users mailing list (which is hosted by ActiveState) and see if anyone there can help out.
Cheers,
Rob