On the compatibility page there are two different ways to set compatibility to a different OS version: The one I know from Windows (just select a version) and one within the button "Change compatibility mode" where several modes such as WIN7RTM can be selected from a dropdown.
My questions are:
- What is the difference between the two features or when should I use which? Or do I need both?
- How do these two modes influence each other? So what if I set WinXP SP3 for the former and WIN7RTM for the latter, for instance?
- What OS do these modes correspond to? WIN7RTM is obviously Windows 7, but there are some entries which I am not clear about, such as "VMHorizonSetup". And entries for Vista and WINXPSP3 seem to be missing (but WINXPSP1 exists).
- Why can multiple entries be selected and what happens in this case. Does it make sense to select WINXPSP1 and WIN7RTM at the same time, for instance?