I received an XLSX file that could not be converted using XLSX2CSV, but Excel and Pages opened it successfully.
After some investigation, I found that XLSX2CSV relies on the 'r' attribute of the row tag, but this attribute is not always present in XLSX files.
Unfortunately, I cannot share the file as it contains sensitive information. However, after saving the file using Excel, the 'r' attribute is added and the conversion works fine.