This is to create a seamless experience wherein, if you have to reboot your PC, you can pick back up from where you left off and resume being productive. What changed? The advanced Windows Update feature which restores running applications after an update has been extended to regular shutdowns and restarts initiated through power options available on the Start Menu and various other locations. There is a change with the Fall Creator’s Update where applications that have registered via RegisterApplicationRestart will re-open after a shutdown or reboot. This has far-ranging impacts across the OS (in a good way). The desire is to create a seamless experience wherein, if you have to reboot a PC, you can pick back up quickly from where you left off and resume being productive. If you want to start with no apps open (other than those set to auto-start via Task Manager/Start), you’ll need to ensure all apps are closed before shutting down or restarting the PC. After reboot/restart, these apps will re-open automatically.When shutting down your PC, any open apps are “bookmarked” (for lack of a better word).After reboot/restart, you have to re-open any app you’d like to use.When you shut down your PC, all apps are closed.This is actually a change in the core functionality of Windows in this development cycle.