Perhaps you're doing this the wrong way, and you should rather try to kill it with Win32::Process, using KillProcess?
Win32::Process::KillProcess($pid, $exitcode)
Terminates any process identified by $pid. $exitcode will be set to the exit code of the process.

If I read this right, $pid should just be a number.

In reply to Re: Need a reliable way to send SIGINT to a perl process on 5.8.8/windows XPpro by bart
in thread Need a reliable way to send SIGINT to a perl process on 5.8.8/windows XPpro by fwashbur

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