If you need to search for text inside the archive without unpacking it first, this free tool can look inside .7z archives. Important Tips for Handling .7z Files
This is the native tool for .7z files. You can right-click the file, select "7-Zip," and choose "Open Archive" to browse contents or "Extract Here" to unpack it. BLP024.7z
How do I search the content of 7-Zip archives (.7z)? - Super User If you need to search for text inside