On the Settings/Build tab the MASM x64 option is grayed out

[techkey]

On the Settings/Build tab the MASM x64 option is grayed out, is this by design?

Lately MASM can compile x64 and even has a ml64.exe so I'm wondering why that option is grayed out.

[Dman95]

Yes, because now MASM x64 is not supported.

[mrfearless]

HJWasm (https://github.com/Terraspace/HJWasm) and last releases of Jwasm, support x64 and are masm compatible.