You cannot open those files directly. They are part of the overall database that defines a LEAP area.
What you can do is the following:
1. Exit LEAP
2. Copy that whole folder so it is a subfolder of the Documents\LEAP Areas folder. I'm going to pretend the folder's name is "My Area"
2. Rerun LEAP
3. From the Area: Open menu option, select that area "My Area".
When sharing LEAP areas among colleagues, I suggest you use LEAP's "Backup" button on the main toolbar. This will compress a whole area into a single .leap file. You can then give that file to a colleague (e.g., by emailing or sharing on a network drive). Your colleague can then install that area onto their PC using the LEAP menu option Area: Install From File.
Hope this helps!