Based on your request, to properly look into a file, you are dealing with a compressed archive, likely requiring specialized software to open and inspect its contents. How to Open/View the Content
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
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 Based on your request, to properly look into
How do I search the content of 7-Zip archives (.7z)? - Super User Based on your request
A free alternative available in the Microsoft Store. [iZip (Mobile): For accessing on iPhone or Android.