new_contents: from identifier import
  
  EXE_PATTERNS = [
    '4D 5A 50 00',
    '4D 5A 90 00',
  ]
  
  class ExeResolver
    def identify(self, stream):
      return Result('exe')
  
  def load(hound):
    hound.add_matches(EXE_PATTERNS, ExeResolver())
  
subject: Create executable_identifier.py