def is_valid_wts(strings_file_path):
    """Checks if the given file is a valid strings file."""
    with open(strings_file_path, 'r') as f:
        try:
            first_line = f.readline()
        except UnicodeDecodeError:  # probably a binary file
            return False

        if not 'STRING' in first_line:  # probably not a strings file
            return False
        else:
            return True