docs: def open_using_pefile(input_name, input_bytes):
          ''' Open the PE File using the Python pefile module. '''
          try:
              pef = pefile.PE(data=input_bytes, fast_load=False)
          except (AttributeError, pefile.PEFormatError), error:
              print 'warning: pe_fail (with exception from pefile module) on file: %s' % input_name
              error_str = '(Exception):, %s' % (str(error))
              return None, error_str
  
          # Now test to see if the features are there/extractable if not return FAIL flag
          if pef.PE_TYPE is None or pef.OPTIONAL_HEADER is None or len(pef.OPTIONAL_HEADER.DATA_DIRECTORY) < 7:
              print 'warning: pe_fail on file: %s' % input_name
              error_str = 'warning: pe_fail on file: %s' % input_name
              return None, error_str
  
          # Success
          return pef, None