Microsoft Windows [Version 10.0.19045.2130]
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C:\Users\x>cd C:\blender-git\blender\source\tools\utils

C:\blender-git\blender\source\tools\utils>python blender_theme_as_c.py userpref.blend
Traceback (most recent call last):
  File "C:\blender-git\blender\source\tools\utils\..\modules\blendfile.py", line 810, in field_get
    return DNA_IO.read_data(handle, header,
  File "C:\blender-git\blender\source\tools\utils\..\modules\blendfile.py", line 898, in read_data
    raise NotImplementedError("Reading %r type is not implemented" % dna_type_id)
NotImplementedError: Reading b'ThemeUI' type is not implemented

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\blender-git\blender\source\tools\utils\..\modules\blendfile.py", line 469, in get_recursive_iter
    yield (path_full, self.get(path_full, default, sdna_index_refine, use_nil, use_str, base_index))
  File "C:\blender-git\blender\source\tools\utils\..\modules\blendfile.py", line 420, in get
    return dna_struct.field_get(
  File "C:\blender-git\blender\source\tools\utils\..\modules\blendfile.py", line 816, in field_get
    raise NotImplementedError("%r exists, but can't resolve field %r" %
NotImplementedError: ("b'tui' exists, but can't resolve field b'tui'", DNAName(b'tui'), DNAStruct(b'ThemeUI'))

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\blender-git\blender\source\tools\utils\..\modules\blendfile.py", line 810, in field_get
    return DNA_IO.read_data(handle, header,
  File "C:\blender-git\blender\source\tools\utils\..\modules\blendfile.py", line 898, in read_data
    raise NotImplementedError("Reading %r type is not implemented" % dna_type_id)
NotImplementedError: Reading b'uiWidgetColors' type is not implemented

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\blender-git\blender\source\tools\utils\..\modules\blendfile.py", line 469, in get_recursive_iter
    yield (path_full, self.get(path_full, default, sdna_index_refine, use_nil, use_str, base_index))
  File "C:\blender-git\blender\source\tools\utils\..\modules\blendfile.py", line 420, in get
    return dna_struct.field_get(
  File "C:\blender-git\blender\source\tools\utils\..\modules\blendfile.py", line 816, in field_get
    raise NotImplementedError("%r exists, but can't resolve field %r" %
NotImplementedError: ("(b'tui', b'wcol_regular') exists, but can't resolve field b'wcol_regular'", DNAName(b'wcol_regular'), DNAStruct(b'uiWidgetColors'))

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\blender-git\blender\source\tools\utils\blender_theme_as_c.py", line 251, in <module>
    main()
  File "C:\blender-git\blender\source\tools\utils\blender_theme_as_c.py", line 244, in main
    convert_data(blend, theme, fh)
  File "C:\blender-git\blender\source\tools\utils\blender_theme_as_c.py", line 207, in convert_data
    ls = list(theme.items_recursive_iter(use_nil=False))
  File "C:\blender-git\blender\source\tools\utils\..\modules\blendfile.py", line 491, in items_recursive_iter
    yield from self.get_recursive_iter(k, use_nil=use_nil, use_str=False)
  File "C:\blender-git\blender\source\tools\utils\..\modules\blendfile.py", line 485, in get_recursive_iter
    yield from self.get_recursive_iter(
  File "C:\blender-git\blender\source\tools\utils\..\modules\blendfile.py", line 485, in get_recursive_iter
    yield from self.get_recursive_iter(
  File "C:\blender-git\blender\source\tools\utils\..\modules\blendfile.py", line 469, in get_recursive_iter
    yield (path_full, self.get(path_full, default, sdna_index_refine, use_nil, use_str, base_index))
  File "C:\blender-git\blender\source\tools\utils\..\modules\blendfile.py", line 420, in get
    return dna_struct.field_get(
  File "C:\blender-git\blender\source\tools\utils\..\modules\blendfile.py", line 810, in field_get
    return DNA_IO.read_data(handle, header,
  File "C:\blender-git\blender\source\tools\utils\..\modules\blendfile.py", line 885, in read_data
    return cls.read_string0(handle, array_size)
  File "C:\blender-git\blender\source\tools\utils\..\modules\blendfile.py", line 935, in read_string0
    return DNA_IO.read_bytes0(handle, length).decode('utf-8')
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xb3 in position 2: invalid start byte

C:\blender-git\blender\source\tools\utils>python --version
Python 3.9.9

C:\blender-git\blender\source\tools\utils>