Keep Coding

I'm working with a very old installer that can read Registry entries but has a difficulty (complex) time executing Windows APIs.
I'm trying to detect whether the PC it's being installed on is in Australia.
Any ideas?

This key:
HKEY_USERS.DEFAULT\Keyboard Layout\Preload
sets the default language for the login screen
The different country codes are listed here:
http://www.windowsitpro.com/Article/ArticleID/14867/14867.html

From my testing and the MSDN page below, this will work:
HKEY_CURRENT_USER\Control Panel\International\sCountry
="Australia"
This corresponds to setting in the Region Options ("Select an item to match it' preferences".
http://support.microsoft.com/kb/102978
This has the advantage of also being able to be read from a non-admin account.