I've been working with Windows System Image Manager today and found myself searching around for the right input locale to use for Australia.

Microsoft have a list of the right locales to use at http://msdn2.microsoft.com/en-us/library/ms776260.aspx

For us aussies,
Locale identifier:0x0c09
Locale: English (Australia)
Locale name: en-AU
Script tag: Latn
ANSI code page: 1252