Grumpy Old Geeks Products Microsoft Excel Product Microsoft Excel 2 mentions in 1 episode The spreadsheet software whose XLS file limits are discussed in relation to UK COVID-19 reporting. Mentions 478: XLS Extreme! Oct 12, 2020 15:19 because of a Microsoft Excel error 16:15 XLS is an outdated file format, and each spreadsheet can only have 65,000 rows.