ZArchiver is a common choice for mobile users to extract and view 7z archives. 7z - man pages section 1: User Commands

The file mna.7z refers to a compressed archive in the , a high-compression file type typically managed by the open-source 7-Zip utility . Technical Summary of 7z Files

: Supports robust AES-256 encryption. In some configurations, both the file contents and the filenames themselves can be hidden until a password is provided.

7-Zip is a file archiver with the highest compression ratio. The program supports 7z (that implements LZMA compression algorithm), Oracle Help Center How To Open .7z Files on Android

To "look at" or report on the specific contents of mna.7z , you must use an archive manager: :