Encoding of svn log on Windows

Hello

I would like to know (and hopefully set!) the encoding used by svn log.
(I know about the --xml option, which works fine, but it is not easily
readable by a human.)

 From what I see, it outputs ISO8859-1, so European àcçeñts are OK, but
Japanese, Chinese, etc. characters are output as question marks (?).
Is there a way, configuring either svn or Windows, to make it produce
UTF-8 ?
It seems somewhat linked to the mysterious "Language for non-Unicode
programs" setting in the Regional Settings, but I could not make it work.

Thank you for your help.

-- 
Samuel Langlois
QA Director - Antelink
18 rue Yves Toudic - 75010 Paris
http://www.antelink.com/