code: def _multi_string_put_transform(cls, item, **kwargs):
          '''
          transform for a REG_MULTI_SZ to properly handle "Not Defined"
          '''
          if isinstance(item, list):
              return item
          elif isinstance(item, six.string_types):
              if item.lower() == 'not defined':
                  return None
              else:
                  return item.split(',')
          else:
              return 'Invalid Valuef _multi_string_put_transform(cls, item, **kwargs):
          '''
          transform for a REG_MULTI_SZ to properly handle "Not Defined"
          '''
          if isinstance(item, list):
              return item
          elif isinstance(item, six.string_types):
              if item.lower() == 'not defined':
                  return None
              else:
                  return item.split(',')
          else:
              return 'Invalid Value'
docs: transform for a REG_MULTI_SZ to properly handle "Not Defined"