Windows embeddable distribution outputs `WARN: Could not find the platform standard library directory!`

[adang1345]

Bug report

Bug description:

When the Windows embeddable distribution version 3.15.0rc1 is extracted and python.exe is run, a warning is shown.

WARN: Could not find the platform standard library directory! The Python 'home' directory was set to 'C:\\Users\\User\\Downloads\\python-3.15.0rc1-embed-amd64', is this correct?
Python 3.15.0rc1 (tags/v3.15.0rc1:37e98da, Aug  4 2026, 11:37:18) [MSC v.1951 64 bit (AMD64)] on win32
>>>

The warning first appears in 3.15.0a7. It is not present in 3.15.0a6 or 3.14.7. #145273 looks suspicious.

CPython versions tested on:

3.15

Operating systems tested on:

Windows

[picnixz]

cc @zooba

[StanFromIreland]

I think it's a duplicate of #148750, based on Steve's comment there, but Windows things are scary so I'll leave this to someone else. ;-)