C# compiling for 32/64 bit, or for ‘Any CPU’? [duplicate]

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On a 32-bit machine:

  • Any CPU: runs as a 32-bit process, can load Any CPU and x86 assemblies, will get BadImageFormatException if it tries to load an x64 assembly.

  • x86: same as Any CPU.

  • x64: BadImageFormatException always.

On a 64-bit machine:

  • Any CPU: runs as a 64-bit process, can load Any CPU and x64 assemblies, will get BadImageFormatException if it tries to load an x86 assembly.

  • x86: runs as a 32-bit process, can load Any CPU and x86 assemblies, will get BadImageFormatException if it tries to load an x64 assembly.

  • x64: same as Any CPU.

It is the JIT compiler that generates an assembly code that’s compatible with the requested target based on this flag.

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