Microsoft Finally Documents the Limitations of Windows 10 on ARM (thurrott.com) 121
For over a year we've been treated to the fantasy that Windows 10 on ARM was the same as Windows 10 on x86. But it's a bit more nuanced than that. Paul Thurrott: 64-bit apps will not work. Yes, Windows 10 on ARM can run Windows desktop applications. But it can only run 32-bit (x86) desktop applications, not 64-bit (x64) applications. (The documentation doesn't note this, but support for x64 apps is planned for a future release.)
Certain classes of apps will not run. Utilities that modify the Windows user interface -- like shell extensions, input method editors (IMEs), assistive technologies, and cloud storage apps -- will not work in Windows 10 on ARM.
It cannot use x86 drivers. While Windows 10 on ARM can run x86 Windows applications, it cannot utilize x86 drivers. Instead, it will require native ARM64 drivers instead. This means that hardware support will be much more limited than is the case with mainstream Windows 10 versions. In other words, it will likely work much like Windows 10 S does today.
No Hyper-V.
Older games and graphics apps may not work. Windows 10 on ARM supports DirectX 9, DirectX 10, DirectX 11, and DirectX 12, but apps/games that target older versions will not work. Apps that require hardware-accelerated OpenGL will also not work.
Certain classes of apps will not run. Utilities that modify the Windows user interface -- like shell extensions, input method editors (IMEs), assistive technologies, and cloud storage apps -- will not work in Windows 10 on ARM.
It cannot use x86 drivers. While Windows 10 on ARM can run x86 Windows applications, it cannot utilize x86 drivers. Instead, it will require native ARM64 drivers instead. This means that hardware support will be much more limited than is the case with mainstream Windows 10 versions. In other words, it will likely work much like Windows 10 S does today.
No Hyper-V.
Older games and graphics apps may not work. Windows 10 on ARM supports DirectX 9, DirectX 10, DirectX 11, and DirectX 12, but apps/games that target older versions will not work. Apps that require hardware-accelerated OpenGL will also not work.