This paper is from the SANS Institute Reading Room site.
List of Fixes and Improvements WinBatch versions 5.0H and Fixed a problem sending Alt-key combinations and other extended keystrokes to a small number
Most Online Ever: 50 (April 26, 2016, 06:20:41
You will need an active evaluation or purchased license to install WebBatch.
These were the results I get regarding decompiling winbatch exe file.