Still the same problems. Unless you exclude people with older excel versions they can still ruin the file. And if the first person in the chain didn't make the

Still the same problems. Unless you exclude people with older excel versions they can still ruin the file. And if the first person in the chain didn't make the change, who would even notice it? So we're back at requiring extreme vigilance without any assurance. Also keep in mind that the first person doesn't necessarily use excel at all. The file might start and end as a text file or TSV.