AppCompatibilityView is a simple tool that displays the list of all programs that run with different compatibility settings, stored in the Registry under HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\AppCompatFlags\Layers and HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\AppCompatFlags\Layers keys. It also allows you to easily modify or delete the compatibility settings of multiple applications at once.