https://www.ablebits.com/office-addins-blog/change-excel-csv-delimiter/
- Click File > Options > Advanced.
- Under Editing options, clear the Use system separators check box.
- Change the default Decimal separator.
https://stackoverflow.com/questions/11421260/csv-decimal-dot-in-excel
https://www.wikihow.com/Change-a-Comma-to-Dot-in-Excel