@classmethod
def isFileReadable(cls, fileName, fileExt, line1='', line2='', line3='', **
    kwargs):
    """
        This function must return True if the file is recognized as of your data format.
        Please be selective so as not to open other file formats by mistake.
        Are provided the file name, extension, and the 3 first lines of the file
        """
    print('File open GraphMydata', fileExt == '.txt', 'line1', line1)
    if fileExt == '.txt' and line1 == 'This is my own data format':
        return True
    return False
