Because there is no console allocated, happens under apache too, see Re^5: Win32: Setting a layer with binmode causes problem with close() on Windows (PerlIO silently fails to close the file) for some details

In reply to Re: Why does IPC::System::Simple not capture output when Perl is running as CGI under IIS? (console) by Anonymous Monk
in thread Why does IPC::System::Simple not capture output when Perl is running as CGI under IIS? by matterofact

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