If you're on Windows, use the official 7-Zip utility. For Mac users, tools like The Unarchiver on woorkup are great for opening these files.
If you’re archiving sensitive documents, you can password-protect your .7z archives using strong AES-256 encryption. sleep.7z
Right-click any folder you don't use daily, select "Add to archive," and choose "7z" as the format. If you're on Windows, use the official 7-Zip utility