>HKEY_CLASSES_ROOT is actually a hive of HKEY_CURRENT_MACHINE, so it should be available to all users with entries under HKEY_USERS (or roaming profiles that merge into HKEY_USERS, and become selected as HKEY_CURRENT_USER) unless there are security policies that block access to specific hives for specific users or groups.

Drat! Why do I always forget this! I know you mean HKEY_LOCAL_MACHINE, BTW.