When this directive is yes, the default, at startup Setup will look in the registry to see if the same application is already installed, and if so, it will use the Start Menu folder name of the previous installation as the default Start Menu folder name presented to the user in the wizard. Additionally, if AllowNoIcons is set to yes, the Don't create a Start Menu folder setting from the previous installation will be restored.

Note that Setup cannot re-use settings from a previous installation that had Uninstallable set to no, since the registry entries it looks for are not created when Uninstallable is no.