Microsoft Office is ARM64 native on Windows on Arm; what confuses people is the CHPE DLLs that allow x86 add-ons and plugins to run: CHPE binaries contain ILP32 aarch64 machine code behind thunks that allow the emulator to translate execution contexts and start/stop executing native code. Most of Office on WoA is CHPE ARM64 code.
Microsoft Office is ARM64 native on Windows on Arm; what confuses people is the CHPE DLLs that allow x86 add-ons and plugins to run: CHPE binaries contain ILP32 aarch64 machine code behind thunks that allow the emulator to translate execution contexts and start/stop executing native code. Most of Office on WoA is CHPE ARM64 code.