We want to ensure that people are in control of what gets pinned to their Desktop, their Start menu and their Taskbar as well as to be able to control their default applications such as their default browser through consistent, clear and trustworthy Windows provided system dialogs and settings. Third party applications running on Windows and Microsofts own apps and features will have access to methods for pinning to these key user experiences and access to directing users to change defaults....

Read the full article at Microsoft Windows Team Blog