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Except you would never had Windows running on either PowerPC and SPARC.

Remember, the very first Windows XP 64 bit release was on Itanium.

Windows NT on PowerPC was an actual product, although running in 32-bit mode.

Um...while not "OG Windows" I guess, PowerPC was an officially supported and shipping Windows NT 3.51 & 4 target[1]. It was released a couple of years before XP 64-bit for itanic. SPARC was a planned NT port, and while it never happened, it could have[2][3].

[1] https://archive.org/details/NT351PMZPPC

[2] https://www.techmonitor.ai/technology/undercurrent_bubbling_...

[3] Legend has it that the SPARC port existed, done by Intergraph, but for Reasons was never a product.

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