Since I cannot browse the specific contents of a private file, here is a general review of the used to create it, highlighting why this specific file type is often chosen: Format Review: 7z Archive
This format supports AES-256 encryption . A key feature of 7z is the ability to "Encrypt file names," which prevents anyone without the password from even seeing what is inside the archive. Arab.7z
While highly efficient, 7z files are not natively supported by all operating systems like ZIP files are. You generally need a third-party tool like 7-Zip (Windows), The Unarchiver (Mac), or ZArchiver (Android) to open them. Since I cannot browse the specific contents of