You're trying to pipe the output to the "tee" command, which is an Unix command and probably isn't available on windows unless you installed Cygwin or a similar utility package.
Of course you could install Cygwin, but.... ;) This node 453546 relates closely to your problem and may provide some answers, like the module IO::Tee.

In reply to Re: logging of win32::process by wazoox
in thread logging of win32::process by Rambo

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