Eryk Sun <eryk...@gmail.com> added the comment:

The embedded manifest in python[_d].exe is missing, so the process is running 
with Windows 8 compatibility mode (i.e. 6.2.9200), and thus the check for 
Windows 11+ (10.0.22000+) is false. It's disappointing that compatibility mode 
doesn't restore the old DOS device behavior, but whatever.

bpo-45220 removed the winuser.h include from the PC\*.rc files, so the 
RT_MANIFEST resource type macro isn't defined. It needs to be defined in the 
file or a common header. For example:

    #define RT_MANIFEST 24
    1 RT_MANIFEST "python.manifest"

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue45354>
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