Some versions of Excel "hides" all used columns because it's missing a <col ... /> tag for each column. If you have 20 columns, you must have 20 <col ... /> tags with min and max attributes equal to its index.
Some versions of Excel "hides" all used columns because it's missing a <col ... /> tag for each column. If you have 20 columns, you must have 20 <col ... /> tags with min and max attributes equal to its index.