According to online sources, it seems that psexec sends its output to stderr. This ought to work:

use File::Temp qw(tempfile);

my $stderr_fh = tempfile();
my $stdout = do {
    open(*STDERR, ">&", $stderr_fh)
      or die "Could not capture STDERR: $!";

    qx(psexec \\\\server netstat -n);
};

seek($stderr_fh, 0, 0);
my $stderr = do { local $/; <$stderr_fh> };

print "psexec stdout: $stdout\n";
print "-" x 60, "\n";
print "psexec stderr: $stderr\n";
[download]

My previous code did not work for a couple of reasons:

• The ">", \$stderr form of open failed on Win32 for some reason. Worked around using a temp file.
• Can't localize *STDERR.