Occasionally Vista and its permission handling really drives me nuts: I
needed to replace a certain .exe file in a subdirectory of "C:\Program
Files" but for some, to me unexplainable, reason Vista at first did not
let me delete the old version.

The file was owned by "Administrators" of which I am a member. When I
checked "Effective Permissions" of that file for my user-id I had ALL
necessary permissions (including "Full Control", "Delete" and "Take
Ownership"). However, if I tried to delete the file or take ownership,
then I got errors that I don't have the necessary permission.

Only after I added my user-id explicitly to the file's permission list
and gave me "Full Control" , then I was able to delete the file. Why was
it not enough that I am of user type "Administrator" and also member of
the "Administrators"-group?

Michael