Why do I get exported files in CSV format?
When you export a tag out of Rule to a file, it makes it easier to know which file format is used.
In Rule, it is automatically controlled at export depending on how big your file is. Excel files have a maximum of 65,000 rows (members) or 500,000 cells and for larger file exports, the file comes in CSV format.
You will find the overall explanation of the CSV här.
For further questions concerning the export please describe your case to firstname.lastname@example.org To get assistance quickly.