in reply to IPC::Open3 Fails Under Win32 When Perl Is Called By Another Program

on win32 procs can be created WITHOUT a STDIN/STDOUT/STDERR (or a console), and that can break some programs that assume a STDIN/STDOUT/STDERR

not sure if that's the case here but it sounds like it might be

see Re: Why does IPC::System::Simple not capture output when Perl is running as CGI under IIS? (console), see Re^5: Win32: Setting a layer with binmode causes problem with close() on Windows (PerlIO silently fails to close the file)

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