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In the context of x64 (x86-64), there was a 64-bit Windows XP Pro based on Windows Sever 2003[1]. It was originally named Windows XP 64-Bit Edition for Extended Systems and later renamed to Windows XP Professional x64 Edition. The WoW64 subsystem is available since Windows XP as well[2].

That's why the symbols available prior to Windows Vista are included into the Win64 source code, but they are commented out by default. If you need to use these functions, feel free to uncomment them and recompile the libraries.

References

[1] Proven, L. (2023). "First ever 64-bit version of Windows rediscovered". The Register.
[2] Boutnaru, Sh. (2024). "The Windows Concept Journey — WOW64 (Windows 32-bit…

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Answer selected by miguelangelcano
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