Dealing with the '\\' during substitution

QUOTE
I'm been unsuccessful at using the RollingFileAppender with a
FixedWindowRollingPolicy that has this FileNamePattern:

<FileNamePattern>$

{user.home}/Client%i.log</FileNamePattern>

"${user.home}

/Client%i.log" gets correctly expanded to "C:
Documents and
Settings
Michel/Client%i.log" when it's passed to the
FixedWindowRollingPolicy constructor.

The problem starts once the filename gets parsed by
ch.qos.logback.core.pattern.parser.Parser: the filename becomes "C:ocuments
and Settingsichel/Client".

File rotations then fails (as would be expected) when trying to rename the
current log to "C:ocuments and Settingsichel/Client1.log"

Is there a way to configure logback to correctly deal with the "
" used in
windows?

End of quote
For original report see: http://www.qos.ch/pipermail/logback-user/2008-June/000476.html