Hello, i found this: by Joson Zhou
You may deploy it by using Regional Options preference extension:
Regional Options Extension
http://technet.microsoft.com/en-us/library/cc754496.aspx
Additionally, here are some Group Policy Preference related articles for your reference:
Enable and Disable Settings in a Preference Item
http://technet.microsoft.com/en-us/library/cc754299.aspx
Information about new Group Policy preferences in Windows Server 2008
http://support.microsoft.com/kb/943729
Group Policy Preferences Frequently Asked Questions (FAQ)
http://technet.microsoft.com/en-us/windowsserver/grouppolicy/cc817590.aspx
Hope it helps.