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Oops I definitely got it wrong. Probably a bit more than a thousand columns now that I think about it. Still a beast. The thing is a database with every column a product id.



I was thinking maybe that meant an older version had a limit of 1024, but according to https://www.askingbox.com/info/xls-and-xlsx-maximum-number-o... it has always been 256 for .xls and 16384 for .xlsx.




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