If a password prompt appears, the contents are encrypted. You will need the specific password to "look into" or extract any of the text files.
Available for both iOS and Android to manage archives on the go. How to Inspect Without Extracting Enz1.7z
If you get an error saying "Cannot open file as archive," the file's header might be corrupted. You can sometimes fix this by using the [Test] command in 7-Zip or opening the file in a hex editor to check the start and end headers. If a password prompt appears, the contents are encrypted
If you just want to see what is inside without unzipping the whole archive, you can use the (included with the Windows install) or the command line: Open your command prompt. Navigate to the 7-Zip folder. How to Inspect Without Extracting If you get