How do I download a file using Perl?

I'm running Perl on Windows XP, and I need to download a file from the URL http://marinetraffic2.aegean.gr/ais/getkml.aspx.

How should I do this? I have attempted using WWW::Mechanize, but I can't get my head around it.

This is the code I used:

my $url = 'marinetraffic2.aegean.gr/ais/getkml.aspx';
my $mech = WWW::Mechanize->new;
$mech->get($url);