When generating a CSV export, there is no option for field separator and a normal "," comma is used.
Although this is a standard, when there are free text answers and user inserts commas in the middle of the text, then it is impossible for MS-Excel to recognize the field correctly.
A simple solution for that is to use ";" as field separator, that is better interpreted by MS-Excel and therefore is easier to import.
This could be an option that can be configured for generating CSV Files.