For programs that do not declare themselves as DPI-aware, Windows Vista supports a compatibility feature called DPI virtualization so system metrics and UI elements are presented to applications as if they are running at 96 DPI and the Desktop Window Manager then scales the resulting application window to match the DPI setting.
Windows Vista provides a compatibility mechanism known as DPI virtualization for programs that do not declare themselves as DPI-aware. This feature ensures that system metrics and UI elements appear as if they are running at 96 DPI, and subsequently, the Desktop Window Manager adjusts the application window size to fit the actual DPI setting.