-Visual Studio includes both 32-bit and 64-bit hosted versions of MASM (the Microsoft Macro Assembler) to target x64 code. Named ml64.exe, it's the assembler that accepts x64 assembler language. The MASM command-line tools are installed when you choose a C++ workload during Visual Studio installation. The MASM tools aren't available as a separate download. For instructions on how to download and install a copy of Visual Studio, see [Install Visual Studio](/visualstudio/install/install-visual-studio). If you only want the command-line tools, not the full IDE, download the [Build Tools for Visual Studio](https://visualstudio.microsoft.com/downloads/#build-tools-for-visual-studio-2019).
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