When I run 
M-x org-export-icalendar-this-file
on a file, in the *Messages* buffer, it says:

Saving file /tmp/orgics3698Kdg...
Wrote /tmp/orgics3698Kdg
Saving file ~/file.ics...
Wrote ~/file.ics

Does the tmp file need to be created since one is not needed for other
exports?


Best wishes,

Enda