http://msmvps.com/blogs/installsite/archive/2009/05/18/windows-7-disguises-as-vista-to-msi-custom-actions.aspxIn every new version of Windows, Microsoft includes numerous “shims” to improve compatibility with existing software. These shims are applied on a per-application basis. You can see which shims apply to an application using the Compatibility AdministratorenCommunityServer 2008.5 SP2 (Build: 40407.4157)