How odd, someone by the name of "Norio Suzuki" seems to have reported the exact same bug back in 2001, and it was indeed fixed in ActivePerl build 630.

------- Description from SUZUKI, Norio 2001-11-06 14:36 

        The script shown below works on ActivePerl build 629, 
but not works on build 630.
---^
system "echo Help!";
system "command/c echo Help me! > help.tmp";
open FILE, "type help.tmp |";
@file = <FILE>;
close FILE;
for (@file) {print}
---$
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s**lil*;  $*=join'',sort split q**;  s;.*;grr; &&s+(.(.)).+$2$1+; $; =
qq-$_-;s,.*,ahc,;$,.=chop for split q,,,reverse;print for($,,$;,$*,$/)
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