Do not know for sure,
but
you may be able to register as a FREE Apple developer and download the extension yourself.
www.apple.com/developer
just don't pay when you get into the site, then click on the "download software" link -- make sure you pick Mac OS 9 and Mac OS X as oneof the items you are into in the little sign-up survey.
As an Apple developer, I can't tell you if the extension is there... but I can highly suggest you sign up and see for yourself.
Have lots of fun!