[GPGOL] Messages goes not ok decripted by PGP

Gpg4win help-en
1

Send an message with Outlook 2003 and GPGol 0.9.91 (gpg4win 1.0.8) and open it with Outlook 2000 and PGP 6.5.8.

Accents goes wrong. This:

áá
çç
ãã
óó
õõ

Is show like this in the decripted e-mail in Outlook 2000:

á
é
í
ó
ú

I’ve tried to change the encoding to many formats on send and on receive, but nothing makes this works. The html attached file goes ok.