code: def modify_path():
      
      # Only modify path on Windows.
      if os.name != "nt":
          return
  
      path = os.environ.get("PATH")
      if path is None:
          return
  
      try:
          extra_dll_dir = pkg_resources.resource_filename("bezier", "extra-dll")
          if os.path.isdir(extra_dll_dir):
              os.environ["PATH"] = path + os.pathsep + extra_dll_dir
      except ImportError:
          pass
docs: Modify the module search path.