Sharing Program Files Directory in XP

I know that with XP Prof that Program Files has been restricted from being shared and accessed successfully (bummer since in peer-to-peer programs that need to be shared are still installed under that directory – thank you Microsoft).
Do you know a workaround so that my XP peer-to-peer computer can access the other XP peer-to-peer computer’s Program Files directory. I have shared the subdirectory I need and given every right I can think of, but it still comes up “access denied.” Firewall is turned off, so that’s not an issue.

Anyone know a registry hack or something? Desperate here!

Thanks. sblades@airmail.net