Well, it works only for the first task list and that too randomly. It does not work for all other tasks lists.
Anyway, I want to try to use the send as CSV action with a different file explorer but the problem is when I used this action the very first time, I chose to use 'Always' the file explorer. Now, how can I reset this setting so that next time when I use the send as CSV action, then Calengoo shows the list of apps and asks me which app to use and then I can pick a different file explorer and verify if it works with a different file explorer. If it does then I suppose the issue is in my file explorer but, if it doesn't then I suppose there is an issue in Calengoo.