multibyte question

lately i download postgresql 8.0.2 (window version)
from postgresql mirror website site. and i read the
document, saying that postgresql support multibyte
encoding
(http://www.postgresql.org/docs/8.0/static/multibyte.html).
but during installation, i can't find the item in the
drop-down list, which indicates to the encoding  -
euc_tw, for instance. should i change to other
version? or what should i do in order to create db to
get encoding supported other than ascii? i apprecaite
any suggestion, sincerely.
jason

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