As a side-note, it's interesting that all of the released versions of NT on Alpha were 32 bit.

Raymond Chen has a blog post[0] about using Alpha to develop 64bit Windows before Itanium hardware was available.

Virtually Fun has some more excellent background on finding a compiler for 64bit Windows[1], finding a copy of Windows 2000 64bit for Alpha AXP[2], and a detailed article about making an ISO from the found copy.

[0] https://learn.microsoft.com/en-us/previous-versions/technet-...

[1] https://virtuallyfun.com/2023/05/05/hiding-in-plain-sight-th...

[2] https://virtuallyfun.com/2023/05/15/windows-2000-64-bit-for-...

[3] https://virtuallyfun.com/2023/06/26/axp64-2210-installation-...