Thank you ShrawanSaxena,
I checked the thread and I found it was interesting for other functionality we might use.
But what we need for now is to know if it's possible to download a file (csv, txt, ...) containing a list of the recipients (eg. emails) and the deliveries opened by each of them. Consider that our campaigns are sent mostly to the same customer base, so we want to know who are "the best and the worst openers".