[CMake] How do you make a 64-bit NSIS installer for Windows?

[Keith Gardner]

My company is trying to package our software on Windows using NSIS in 32-bit and 64-bit but the install path always assumes that the package is 32-bit.  If you are on a 64-bit machine, 32-bit and 64-bit NSIS installers use "C:\Program Files (x86)" as the install path.  The proper way for a 64-bit installer is to have the path be "C:\Program Files" on a 64-bit machine and not allow an install on a 32-bit machine.  Is there any support for this in CMake or does the functionality need to be added?

Thanks,
Keith
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