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Windows on arm supports both 32 and 64 bit arm software. x86-64 emulation is missing because Intel threatened to sue (https://newsroom.intel.com/editorials/x86-approaching-40-sti...)

Yep, who wants to guess Intel made some key hires of transpilation experts to develop a nice patent arsenal just for this purpose?

The last of the patents preventing x86_64 binary translation expires Q3 this year, expect fun things to happen. (and no, MS isn't sleeping)

Which patent is that? Genuinely curious.

What is different about Rosetta 2 that is keeping Intel from doing this? Genuinely curious about this.

Rosetta 2 is a binary translator, not an emulator. It merely converts x86 instructions to ARM instructions.