If the built-in tool fails, download free apps like The Unarchiver or Keka . ⚡ Why Use the .7z Format for Social Videos? How to open a .7z file - Microsoft Q&A
Run the installer and then right-click your "Social Videos.7z" file. Social Videos.7z
Newer versions of macOS can often open these by double-clicking. If the built-in tool fails, download free apps