The file extension belongs to 7-Zip , a popular free and open-source file archiver used to compress data.
They offer much better compression than standard ZIP files. TRIO05A.7z
He had spent three months infiltrating the secure servers of Orion Cybernetics to find it. Rumors on the dark web said "Project TRIO" held the source code for the world's first true quantum artificial intelligence. The file extension belongs to 7-Zip , a