One of us is confused. The value returned from Win32:MsgBox is just an integer. The way you're calling it, it should always be "1". So the variable $output will just contain the value "1". Just saying:
  $output;

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doesn't do anything. In fact, if you run your program with "-w" or "use warnings", you'll get the message "Useless use of private variable in void context".

Perhaps you want to make a subroutine like this:

sub showend {
  Win32::MsgBox("Script completed.", MB_ICONINFORMATION);
}

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Then you can call showend() where your are now doing $output.

In reply to Re: Win32 MsgBox declaration by Thelonius
in thread Win32 MsgBox declaration by Anonymous Monk

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