问题
I'm building a Windows 10 UWP app, and would like to know if it will run on Windows Phone 8.1 and/or Windows 8.1 Desktop. Windows 8.1 is still quite prevalent, and I would like to be able to reach these users with my app.
回答1:
Windows 10 apps can only run on Windows 10 (and newer). If you want to target 8.1, you have to build a 8.1. A 8.1 should run on Windows 10 without any problems.
来源：https://stackoverflow.com/questions/35054932/can-windows-10-uwp-run-on-windows-8-1-devices