Active Directory and BIND can not use _ char ?

[ip guy]

Hi all
I've been running bind 9 for a number of years now with a 2000 MS active
directory without a single hitch.
I am about to upgrade the domain controllers to 2003 and so though i should
do the same for bind
In my dev/test environment, it seems that BIND 9.3.3rc2 does not like the _
char, BIND 9.2.2 didn't care.
Can anyone suggest a work around as I'm sure MS needs the _ in the zone
files

_msdcs.domainname.org
_sites.domainname.org
_tcp.domainname.org
_udp.domainname.org