If the file was created with header encryption ( -mhe=on ), you will be prompted for a password before you can even see the list of files inside.
Other software like WinZip or PeaZip can also handle .7z files by right-clicking and choosing the respective "Unzip" or "Extract" options. Troubleshooting Common Issues Shelikes.7z
The file appears to be a compressed archive created with 7-Zip , a popular open-source utility. The .7z extension signifies the 7z format , known for high compression ratios and support for strong AES-256 encryption. How to Access the Contents If the file was created with header encryption