Since no one has publicly verified the decryption of the actual original file (if it exists beyond a hoax), the "story" is fueled by speculation:
Many believe it is a defunct or "stalled" ARG. Similar to the Junko Junsui or Lake City Quiet Pills mysteries, the file serves as a MacGuffin to lead players to various websites or coordinates. Cuinto7324.7z
The story began when a user (often cited as appearing on 4chan's /x/ board or specialized Discord servers) claimed to have found a 7-zip file named Cuinto7324.7z on an old hard drive or a hidden directory of a defunct deep-web forum. Since no one has publicly verified the decryption
In most online "mystery" cases like this, the file is either a (a randomly generated encrypted file with no actual contents) or a malware trap designed to get curious users to download and attempt to run decryption scripts that actually infect their own systems. In most online "mystery" cases like this, the