microsoft.com/globaldev/drintl/faqs/Locales.mspx#EIAA
How to add a language collection in Windows XP?
- From Start menu, select Settings then Control Panel.
- Start Regional Options.
- Click on Languages tab.
- In Supplemental language support box, check the checkboxes of desired language collection(s) and click OK.
- Additional files will be copied to your machine. You may need to provide the Windows XP CD or the network share name.
- After reboot, support for new languages will become available.
The more things change, The more they stay the same.