Compatibility and Virtualization
In previous versions of Windows, applications could store files inside the \Program Files and \Windows folders, and they often took advantage of this to store common data that was shared among all users. The same was true for the Registry, a database of user and setup information—programs frequently stored information in the HKEY_LOCAL_MACHINE Registry section.
To make Windows more secure, user programs are no longer allowed to store files or Registry data in these areas unless their setup programs explicitly change Registry security settings to permit it. (And this has to happen while the program is being installed under elevated privileges.)
Most of the applications that ship with Windows are subject to these ...
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