Editing Fat binary (section)

==Windows==
===Fatpack===
Although the [[Portable Executable]] format used by Windows does not allow assigning code to platforms, it is still possible to make a loader program that dispatches based on architecture. This is because desktop versions of Windows on ARM have support for 32-bit [[x86]] emulation, making it a useful "universal" machine code target. Fatpack is a loader that demonstrates the concept: it includes a 32-bit x86 program that tries to run the executables packed into its resource sections one by one.<ref name="Mulder_2018"/>

===Arm64X===
When developing Windows 11 ARM64, Microsoft introduced a new way to extend the [[Portable Executable]] format called Arm64X.<ref name="Microsoft_2022"/> An Arm64X binary contains all the content that would be in separate x64/Arm64EC and Arm64 binaries, but merged into one more efficient file on disk. Visual C++ toolset has been upgraded to support producing such binaries. And when building Arm64X binaries are technically difficult, developers can build Arm64X pure forwarder DLLs instead.<ref name="Microsoft_2023"/>