I have created a windows 8.1 project by selecting the template in the screenshot below:
I want to minimize it to system tray and keep it running while it's in the tray. How do I do that for a store app? I found WPF Application that only has a tray icon and some similar links but I cannot reference System.Windows.Forms namespace in a Runtime app it seems.
You can't minimize Winows Store Apps into the system tray, only Windows Forms and WPF apps can do that.
You can help that happen by voting here UWP System tray support