You can achieve the same by creating a segment.
Please find below the steps to create segment for Openers data:
1) Login to the panel
2) Click on Data --> Contacts --> Create Segment
3) From Select Contact Type choose Contact Master where all data will be present.
4) You can give the specific Segment Name as per your wish.
5) Use the conditions as per below screen-shot and Click on Done.
6) You can click on Get Count to check the count that you have received.
7) Click on Create Segment button and the Segment gets created.
8) You can mouse hover the created segment and export the CSV file which contains the last 60 days openers data.