It's not mandated on for the newer Windows on Arm64 systems, but is configurable there. Windows RT was just Windows 8 with a locked code signing policy, yup. A

It's not mandated on for the newer Windows on Arm64 systems, but is configurable there. Windows RT was just Windows 8 with a locked code signing policy, yup. And yes, Office on Windows RT was Win32, as were File Explorer, MMC, ... it's just recompiled Win8 after all.