For such type of thing you should always have something at the last column, even return might be enough A,B,,,,,,,," " C,D,,,,,,,," " That's newline there bet

For such type of thing you should always have something at the last column, even return might be enough A,B,,,,,,,," " C,D,,,,,,,," " That's newline there between " and " I guess Excel loads that internally through a convertor, trims the rightmost unused columns, and then saves it that way.