: Legitimate software generally uses descriptive filenames (e.g., Setup_v1.0.7z ). Random strings like MnWWojIHafVyrgox are frequently used by malware or adware to avoid detection by security filters or to store encrypted data for "phoning home" to a server.
: Upload the file to VirusTotal to check it against dozens of different antivirus engines. MnWWojIHafVyrgox.7z
: Opening the archive could trigger a script or launch an executable file hidden inside. MnWWojIHafVyrgox.7z