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by i_are_smart 2076 days ago
Modern versions of excel (after office 2007), using .xlsx files, have a 1,048,576 row limit. But older versions of excel (before office 2007) used .xls files and had a limit of 65,536 rows.

I could easily see them exceeding this limit, if they were using an older version of excel.

Alternatively, even the new versions of excel enforce the 2^16 row limit if working on a .xls file instead of a .xlsx file.