These were the results I get regarding decompiling winbatch exe file.
Code:
http://techsupt.winbatch.com/ts/T000001066F9.html
http://techsupt.winbatch.com/webcgi/webbatch.exe?techsupt/tsleft.web+WinBatch/Compiler+Exe~Crack~Protection.txt
http://techsupt.winbatch.com/webcgi/webbatch.exe?techsupt/tsleft.web+WinBatch/Miscellaneous+Autoit~vs~WinBatch.txt
http://www.autoitscript.com/forum/topic/100564-winbatch-vs-autoit-security/page-2
Maybe you can try contact the person on the last link, he mention something about dissecting the winbatch exe file.
Let me know if you ever manage to decompile a winbatch exe to source code, I'm very interested in it.