To install a MUI Language for XP we folow these steps:
1 ) Download the the MUI Pack with the language(s) you need.
2 ) Get the latest MUIsetup.exe from SP3 and replace the one included in the MUI pack download.
3 ) Execute it using this command line where "0416" is your language code, in this case Portugese.
muisetup.exe /i 0416 /d 0416 /r /s
4 ) Then we execute another command that changes Regional Settings for all users that log onto that machine again using the language code in the BR.TXT file.
The BR.TXT file has the following information:
LanguageGroup = 1
UserLocale = 00000416
SystemLocale = 00000416
InputLocale = 0416:00000416
MUILanguage = 0416
UserLocale_DefaultUser = 00000416
InputLocale_DefaultUser = 0416:00000416
MUILanguage_DefaultUser = 00000416
You can replicate this process for the language or leave out Step 4 if you do not want to change the default settings on the computer.
We use a wise script to wrap this all up and execute it quickly. Hope this helps anyone needing to do this in the future.