In my case, there is good reason for that. Did you notice the OPs program name: program.exe?

On win32, it makes no difference. The following code does kill 15, but notice that it is reported by the terminatng process as sigbreak:

Perl> $pid = open CMD, '-|', q[perl.exe -le"$SIG{TERM}=sub{print 'here
+' }; $|++; print ++$i while sleep 1"] or die $!;;

Perl> print scalar <CMD> for 1 .. 10;;
1
2
3
4
5
6
7
8
9
10

Perl> kill 15, $pid;;
Terminating on signal SIGBREAK(21)
[download]

The pseudo signals perl provides on win32 are useful, but limited. And bear very little resemblance to POSIX signal handling.