It is just as the error message says. You are trying to use the list form of pipe-open:

open DH, '-|', ... # this is the list form of pipe-open
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... and on Windows Perl, this is not implemented. End of the story.

As an alternative for your case, maybe you want to use the string-form of pipe open?

my $cmd = "ct-energy -s $suffix ${prefix}.ct";
open my $dh, "$cmd |"
    or die "Can't launch [$cmd]: $! / $?";

while( <$dh>) {
    ...
};
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Also see open and perlport.