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It was 64-bit Windows versions, 16 bit was never supported not even on XP 64-bit. I think W8 was the first 64-bit only Windows.


Windows 11 drops IA32, and thus (first party) MS-DOS and Windows 3.x support.

Windows actually has some special cased support for (at least some of) the problematic 16 bit InstallShield installers to run a 32 bit version instead on AMD64.


Windows 11 was the first 64-bit only build of the NT-based Windows tree. There are 32-bit x86 builds of all previous versions.


> I think W8 was the first 64-bit only Windows.

Nope, that would be Windows 11! There is a 32-bit version of Windows 10.




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