The difference is STDIN/STDOUT/STDERR/
wperl.exe, being a windows GUI application, doesn't have these
perl.exe, being a windows console (cmd.exe) application, does have these, but it also has a console window
So you start wperl because it has no console window, make sure the children get hidden, then launch a hidden perl.exe , because it has a console and STDIN/STDOUT/STDERR
Apparently Net::SFTP ... needs a STDIN/STDOUT/STDERR for pipes and such
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