In NT prior to Vista, if you created a local folder and were in the Administrators group and gave that folder Full Control, you could access that folder locally. Now in Vista/7/2008 it says "would you like to add yourself permanently to this folder?" and then you click proceed and it adds your account.
If you just have:
It padlocks the folder and does the question prompt.
However if you have one of the following:
SYSTEM Administrators [another group to which you are a member and have access to the folder with] OR Authenticated Users group [with read or more] OR CREATOR OWNER [but it will just re-add your user account if you leave CREATOR OWNER]
It doesn't padlock the folder and acts as you'd expect.
Why does this work this way? This seems counter-intuitive to me. It seems like it opens up a potential to confuse people and introduce security holes. Is there a "best practice" and if so, what it is?