The CHS and CHP versions of Office XP (both the SKU versions and the Language Packs) all ship with two very exciting features: an extended Unicode IME to handle Extension A and B, and a version of the SimSun font, extended by the Founder font company, to represent these CJK ideographs.
Unfortunately, they did not translate the help file (surime.chm) to allow customers who are interested in using this exciting new input method to understand how to use it (if they are unable to read the original help file). These web pages provide an English translation of that help file.
For more information on the accurate display of CJK on these pages, see the "Code Charts" link, below.
Background - Unicode, ISO, Windows, and Office