I'm not sure that it actually resides in an adm file
When I go onto any of my Win2k DC's (which don't have the GPMC or
anything installed on them) I can't manage the software restriction
policies. However from my desktop, I can, and they work. I don't know
whether that functionality was added due to the GPMC update, the SP2
adm file updates, 2k3 admin tools, or what.
Pretty cool, huh?