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Like I said, any user can run an app from a protected directory such as program files, because reading is allowed. Writing is however not allowed. For writing you need admin access, which is why the installer throws a UAC admin request. As far as I know, Winamp itself does NOT try to write to its own folder. Instead, it writes all its stuff either to HKCU registry or to $APPDATA / $LOCALAPPDATA.
(If I'm wrong and it *does* try to write to its installation folder, then winamp is broken and needs to be fixed.)
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