http://www.perlmonks.org?node_id=841731


in reply to Re^2: exec() on Windows
in thread exec() on Windows

start is a "shell builtin" command and does not exist as an external program, which is why it does not work with exec.

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Re^4: exec() on Windows
by ikegami (Patriarch) on May 26, 2010 at 14:57 UTC
    Which means it shouldn't work for system either, except system is hacked to make this work on Windows. It explicitly behaving differently than documented.