Hi there, Windows ARM64 is coming, so we strongly need some support for ARM assemblers in CMake: `armasm.exe` and `armasm64.exe`. `.vcxproj` supports new node `MARMASM` and requires `<Import Project="$(VCTargetsPath)\BuildCustomizations\marmasm.props" />` and `<Import Project="$(VCTargetsPath)\BuildCustomizations\marmasm.targets" />` in additional. This feature should works for MSVC++ v142. As I understand from CMake sources we need new compiler type `ASM_MARMASM` to be implemented.