I'm trying to build a "Hello, world" for Arm64EC using Visual Studio 2022 and these instructions: https://learn.microsoft.com/en-us/windows/arm/arm64ec-build

I don't have an Arm64 Developer Command Prompt in my Start menu. How to install it?

I have found vcvarsamd64_arm64.bat but the compiler says it doesn't understand the /arm64ec option:

C:\0>type hello.c
#include 

int main()
{
    puts("Hello, ARM64EC");
    return 0;
}

C:\0>"\Program Files\Microsoft Visual Studio\2022\Community\VC\Auxiliary\Build\vcvarsamd64_arm64.bat"
**********************************************************************
** Visual Studio 2022 Developer Command Prompt v17.14.23
** Copyright (c) 2025 Microsoft Corporation
**********************************************************************
[vcvarsall.bat] Environment initialized for: 'x64_arm64'

C:\0>cl /O2 /arm64ec hello.c
Microsoft (R) C/C++ Optimizing Compiler Version 19.44.35222 for ARM64
Copyright (C) Microsoft Corporation.  All rights reserved.

cl : Command line warning D9002 : ignoring unknown option '/arm64ec'
hello.c
Microsoft (R) Incremental Linker Version 14.44.35222.0
Copyright (C) Microsoft Corporation.  All rights reserved.

/out:hello.exe
hello.obj