After a fresh update from upstream
> PCbuild\build.bat -D (or without -D)
on my machine ends with

  python.vcxproj -> f:\dev\3x\PCbuild\amd64\python_d.pdb (Full PDB)
  Python path configuration:
    PYTHONHOME = (not set)
    PYTHONPATH = 'f:\dev\3x\Lib'
    program name = 'f:\dev\3x\PCbuild\amd64\python_d.exe'
    isolated = 0
    environment = 1
    user site = 1
    import site = 1
    sys._base_executable = 'f:\\dev\\3x\\PCbuild\\amd64\\python_d.exe'
    sys.base_prefix = 'f:\\dev\\3x'
    sys.base_exec_prefix = 'f:\\dev\\3x'
    sys.platlibdir = 'lib'
    sys.executable = 'f:\\dev\\3x\\PCbuild\\amd64\\python_d.exe'
    sys.prefix = 'f:\\dev\\3x'
    sys.exec_prefix = 'f:\\dev\\3x'
    sys.path = [
      'f:\\dev\\3x\\Lib',
      'f:\\dev\\3x\\PCbuild\\amd64\\python310_d.zip',
      'f:\\dev\\3x\\DLLs',
      'f:\\dev\\3x\\lib',
      'f:\\dev\\3x\\PCbuild\\amd64',
    ]
EXEC : Fatal Python warning : init_fs_encoding: failed to get the Python codec
of the filesystem encoding [f:\dev\3x\PCbuild\python.vcxproj]
  Python runtime state: core initialized
  Traceback (most recent call last):
    File "f:\dev\3x\Lib\encodings\__init__.py", line 31, in <module>
f:\dev\3x\PCbuild\python.vcxproj(123,5): warning MSB3073: The command "setlocal
\r
f:\dev\3x\PCbuild\python.vcxproj(123,5): warning MSB3073: set PYTHONPATH=f:\dev
\3x\Lib\r
f:\dev\3x\PCbuild\python.vcxproj(123,5): warning MSB3073: "f:\dev\3x\PCbuild\am
d64\python_d.exe" "f:\dev\3x\PC\validate_ucrtbase.py" ucrtbased" exited with co
de -1073741819.
  pythonw.vcxproj -> f:\dev\3x\PCbuild\amd64\pythonw_d.exe
  pythonw.vcxproj -> f:\dev\3x\PCbuild\amd64\pythonw_d.pdb (Full PDB)

EXEC : Fatal Python warning : init_fs_encoding: failed to get the Python codec
of the filesystem encoding [f:\dev\3x\PCbuild\python.vcxproj]
f:\dev\3x\PCbuild\python.vcxproj(123,5): warning MSB3073: The command "setlocal
\r
f:\dev\3x\PCbuild\python.vcxproj(123,5): warning MSB3073: set PYTHONPATH=f:\dev
\3x\Lib\r
f:\dev\3x\PCbuild\python.vcxproj(123,5): warning MSB3073: "f:\dev\3x\PCbuild\am
d64\python_d.exe" "f:\dev\3x\PC\validate_ucrtbase.py" ucrtbased" exited with co
de -1073741819.

I believe I pulled and rebuilt fine just a few days ago. Subsequently running
> python
ends with

Fatal Python error: init_fs_encoding: failed to get the Python codec of the filesystem encoding
Python runtime state: core initialized
Traceback (most recent call last):
  File "f:\dev\3x\\lib\encodings\__init__.py", line 31, in <module>

Running > chkdsk F: /scan revealed no obvious disk error, but there could be corrupted bytes in some file, but I don't know what file(s) to check (if text) or delete and have git redownload.  Anyone else have a similar problem?