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Asked: 2026-05-28T07:27:05+00:00

How is ‘Any CPU’ implemented on low level? Aren’t there two formats: PE32 and

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How is ‘Any CPU’ implemented on low level?

Aren’t there two formats: PE32 and PE64? Both Windows x86 and x64 can run 32-bit. But, it’s not made by having a 64-bit executable inside the 32-bit and run it in memory, because then the process will have a different ID than the starter. So how did they do it?

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  1. Editorial Team

    In his argument against Any CPU, Rick Byers also includes some background information that is relevant to this question:

    Since we wanted people to be able to write .NET libraries that they could re-use from both 32-bit and 64-bit processes, we worked with Windows to extend the OS loader support to enable architecture-neutral (“AnyCPU”) PE files.

    Check the link above for more detailed information.

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