wine users - Apr 2012 - Get OS version information within a batch script

How would one find out if a batch script was running on wine versus some version
of win32 natively? I want to be able to remind the user that a native Linux port
is available for various distros, but only if the install script realizes it is
running on a Linux machine.

I searched online and found some stuff that can find versions of win32, but not
wine as well. On of the ones that look promising were:
http://malektips.com/xp_dos_0025p.html but I might be wrong.
 
Thanks

You could check the directory structure for default values (Such as
Z:\usr\share) or registry values only found in wine (But I wouldn't know
what such registry values are)

Both of these are pretty hack n slash

Answered here
http://wiki.winehq.org/DeveloperFaq#detect-wine

Thanks Ma Xiaojun and J V. The devfaq has an interesting point.