Adobe PDF Library supports Windows 8 and Windows 10, but not Metro UI and Windows Runtime. Library applications developed under Windows 7 or earlier continue to run on Windows 8 and Windows 10 in legacy mode.
Non-Metro applications execute in this environment and enjoy the same user interface and programming interfaces that are currently available with Windows 7. Adobe PDF Library based applications will run in this mode.
With Windows 8, Microsoft introduced the Metro UI and the Windows Runtime (Metro and WinRT). Metro applications can only use WinRT - based components and system calls.