Windows development guideline states that the app should always be ready for that. That's because the close button on Modern Apps, unlike Win32 old apps, alway

Windows development guideline states that the app should always be ready for that. That's because the close button on Modern Apps, unlike Win32 old apps, always did force quitting. That's why with Windows Modern apps, there isn't the popup for "Do you want to save the changes?". Because the guideline states that the app should always save changes automatically (Since 2013 there's proper APIs to store these data, and it even sync with your other PCs).