def _is_mobi(file_bytes: bytes) ->bool:
    """
	Decide if a file is a MOBI/AZW3 file.
	From ./se/vendor/kindleunpack/mobi_sectioner.py lines 49-53
	"""
    return file_bytes[:78][60:60 + 8] in (b'BOOKMOBI', b'TEXtREAd')
