ModernMix can run new interface applications on Win8 traditional desktops.

Stardock has developed and released the Start8 application for restoring the Win8 start menu and start button. Recently, the company has released a fun application, ModernMix, which allows Windows 8 users run the Win8 new interface application (formerly known as the Metro interface application) in a traditional desktop window. In other words, it allows Win8's new interface application to run on Win8 traditional desktops in the form of windows. The window size can be adjusted. The next time you open the application, you will remember the last adjustment. The app costs $4.99 and can be used for free for 30 days.
Icon: Weather application running in Win8 traditional desktop window after using ModernMix
Icon: Win8 new interface version weather application when not using ModernMix

In addition, ModernMix also supports users. The Win8 new interface application is locked to the taskbar so that it can be opened more quickly.

It's also easy to close the new interface in Win8's traditional desktop window. The minimize, maximize, and close buttons in the upper right corner of the window are the same as Windows traditional programs.

Note: The original name of the software development company Stardock is unknown. After the official release of Windows 8, the company has developed a variety of Windows 8 interface modification tools, such as the Start8 and the Start button to get back to the Start8. Screen wallpaper, tile modification tool Decor8, etc.