Kind of confused...
The file is not included in jboss-3.0.0beta.zip, but is mentioned in the online manual.
That part of the manual should come with a big
warning saying only for JBoss2.4
The configuration for 3.0 is done in
jboss-service.xml for core services.
Other "hot-deployable" configuration you can find
in the deploy directory.
Regards,
Adrian