I conducted the following tests regarding VTK's support for UTF8 encoded Chinese paths

Support
4

Thanks, this is useful information. We would like these readers to just work with unicode filenames, without any configuration settings. There is an open issue for this (#17779).

  1. vtkOpenFOAMReader fails because it uses vtkDirectory, and vtkDirectory is broken for UTF-8 on Windows.
  2. vtkTecplotReader fails because it calls gzopen() for compressed files, it needs to use gzopen_w() on WIndows.
  3. vtkCGNSReader fails because the cgns library uses _open() instead of _wopen() on WIndows. This might not be fixable in VTK, it might have to be fixed in the cgns repository.