[syslinux] syslinux.exe: Does -o option not yet implemented?

[Regid Ichira]

    C:\syslinux>syslinux.exe -o xp c:
    At least one specified option not yet implemented for this installer.

    C:\syslinux>syslinux.exe -o xp -d . c:
    At least one specified option not yet implemented for this installer.

syslinux.cfg has a lebel xp statement.

  Am I doing something wrong?  If not, shouldn't 
http://www.syslinux.org/wiki/index.php/SYSLINUX#NT.2F2K.2FXP
get fixed?