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I didn't know about the 64-bit toolchain, where can you get it?

It's an optional install package when you install Visual Studio.

We have it installed, do you have any reference about how to use it from a build process?

If you run the Visual Studio x64 tools command prompt from the start menu, it will set up the environment to have the 64-bit toolchain in your path.

Thanks, but we've been struggling with building using the amd64 chaintool from visual studio.