http://bugs.winehq.org/show_bug.cgi?id=21046
--- Comment #1 from Austin English austinenglish@gmail.com 2009-12-23 13:31:14 --- != is not supported:
C:\Documents and Settings\austin\Desktop>if %ERRORLEVEL% != 0 echo foo != was unexpected at this time.
The rest are though. Also, see: http://ss64.com/nt/if.html