UnicodeDecodeError: 'utf-8' codec can't decode byte 0xe4 in position 617: invalid continuation byte #2683

XLWINGS 0.33.21 is installed on Windows10 machine with EXCEL 2016 (german). Opened my XLSM file. Started VSCODE, typed in 'XLWINGS VBA edit' and got:
Traceback (most recent call last):
File "", line 198, in _run_module_as_main
File "", line 88, in run_code
File "C:\dev\Python313\Scripts\xlwings.exe_main.py", line 7, in
sys.exit(main())
~~~~^^
File "C:\dev\Python313\Lib\site-packages\xlwings\cli.py", line 1305, in main
args.func(args)
~~~~~~~~~^^^^^^
File "C:\dev\Python313\Lib\site-packages\xlwings\cli.py", line 857, in vba_edit
path_to_type = export_vba_modules(book, overwrite=False)
File "C:\dev\Python313\Lib\site-packages\xlwings\cli.py", line 764, in export_vba_modules
exported_code = f.readlines()
File "", line 325, in decode
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xe4 in position 617: invalid continuation byte

What can I do to prevent this error?