'File is in EMF format?'

def isEMF(self):

    if (1 <= self.current_length):
        return (self[0].name == 'emf_header')
    if (self.size < (44 * 8)):
        return False
    magic = EMF_Header.MAGIC
    return (self.stream.readBytes((40 * 8), len(magic)) == magic)
