Hmm, I have Krita installed and it never did this. I only just had a look to see what the default for CSV files was and LibreOffice Calc is it on my system with no changes. I have had some weird ones before though after installing some programs like this (can’t remember which ones)
Odd. I know I installed it alongside many others using the ‘common applications’ button in the “welcome to Endeavour” application. I have probably started Krita once before just to check it out. I know I have never entered ‘Default applications’ in system settings before just now, nor have I opened any CSV files before now.
EDIT: Just checked, Krita is not added as an application for any other random file types, that I can find, just this.
I will say that it’s a bad idea, because Krita throws an error when the CSV file’s contents aren’t as expected, even though the file is perferctly correct CSV. In other words: They have built their own standard on top of CSV and should have called it something else (.ksv!). But that’s not really relevant here, I guess. I will just shove it down the priority list.
Rather than pushing it down the list, you should probably remove it, as it is very unlikely you’ll ever want to open a .CSV file in Krita. Removing also reduces the clutter in the Open With menu.
If you ever need to do it, you can open Krita first, then drag and drop the file.