I have created a network installation point for Office 2010 ProPlus that contains two language packs — en-us, and cs-cz (Czech). I've also created an Office Customization File.
In my environment the OS language is English, however the locale is set to Czech. Office 2010 setup when run from the network installation point keeps running with Czech as the shell UI language. This behavior is documented.
I attempted to modify the config.xml file in the ProPlus.WW directory and add the following two lines:
<AddLanguage Id="en-us" ShellTransform="yes"/>
<AddLanguage Id="cs-cz" />
When I run setup.exe /adminfile myconfig.msp the setting is ignored. When I try to specify the config file on the command line like setup.exe /adminfile myconfig.msp /config ProPlus.WW\config.xml setup just displays the set of available command-line options, apparently not accepting these two parameters at once.
So, how to override this behavior and force English to be the default shell UI language?