changing default file manager in gnome-shell?

[Brian Millett]

I've gotten to like pcmanfm over nautilus for gnome-shell.  But when I
insert a usb stick other device, nautilus is launched.

How do I change that behavior?

Thanks.
-- 
Brian Millett - [ Talia Winters, "A Spider in the Web"]
"Taro Isogi spent his life improving the lives of others. He built a business
 based on that principle, and he never broke a rule or harmed another to do
 it. Mars was his dream, Captain, now he's been murdered for it, and you're
 trying to cast the blame on him."
        
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