Describe the "unzipping" experience. Talk about the file size, the encryption (if any), and that split second of anticipation before the progress bar hits 100%.
Option 1: The "Digital Mystery" (If it's an ARG or Unidentified File) 4568764132.7z
Option 3: The Creative Fiction (If you want to tell a story) Describe the "unzipping" experience
You downloaded a file you weren't supposed to. The filename is just a coordinate, or perhaps a timestamp of an event that hasn't happened yet. the encryption (if any)