For a Microsoft Windows XP version of the article, see
289125 How to create the regional and language settings for an unattended installation of Windows MultiLanguage Version
http://support.microsoft.com/?id=289125

For a Microsoft Windows Server 2003 version of the article, see
325856 How to specify regional and language settings for an unattended installation of Windows MultiLanguage Version in Windows Server 2003
http://support.microsoft.com/?id=325856

APPLIES TO

• Windows Vista
• Windows Server 2008
• Windows 7
• Windows Server 2008 R2

This blog describes the regional and language settings that you can specify for an unattended installation of Windows Language Packs (LP, used to be known as MultiLanguage Version).

Windows has added support for default locale, input locale, and user interface (UI) language as entries in an unattended installation Answer file.
or
The user is trying to use control intl.cpl (old rundll32) to change the regional settings language for multi user language interface, MUI
or
Administrators needing a way to programmatically change language options on many Vista or Windows Server 2008
based systems after they had been deployed.
Specifically, you need a way to programmatically make it happen.

Solution:

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http://www.microsoft.com/globaldev/vista/vista_tools/vista_command_line_international_configuration.mspx

More information:

A good sample is at:
http://blogs.msdn.com/michkap/archive/2006/05/30/610505.aspx