This is just a wild guess, but I think you may need the "cmd" shell to process the "|" pipes.

Instead of starting your cmd with "tar ...", try
"cmd /c tar ...".

This will give the windows shell (cmd.exe) a chance to manage the pipe.

     "There are only two truly infinite things. The universe and stupidity, and I'm not too sure about the universe"- Albert Einstein

In reply to Re: opening '-|' on Windows by NetWallah
in thread opening '-|' on Windows by Tanktalus

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