def build_windows_time(high_word, low_word):
    """
    Generate Windows time value from high and low date times.

    :param high_word:  high word portion of the Windows datetime
    :param low_word:   low word portion of the Windows datetime
    :return:  time in 100ns since 1601/01/01 00:00:00 UTC
    """
    return (high_word << 32) + low_word