I love that little nugget of info at the end. You could originally run excel standalone without an OS and it came with windows 2.1 bundled
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And of course the subject of so many BSOD photos…
Those are probably CE and not PE?
https://en.wikipedia.org/wiki/Windows_Embedded_Compact
or Embed based on CE
WinPE is the Windows Preinstallation Environment, used as the basis for Windows installation and recovery, and available for custom builds as an add-on to the Windows ADK[1], but AFAIK not intended or licensed for embedded use.
[1] https://learn.microsoft.com/en-us/windows-hardware/manufactu...
It was probably embedded standard based on NT/XP/7