This indicates the first installment of the "Payback" story arc.
While specific details depend on the platform from which it was downloaded, Deathstrike2-Payback-Chapter-01.zip
Most likely a collection of high-resolution images (for a comic/manga) or document files (for a novella). This indicates the first installment of the "Payback"
If the file fails to open, it may be a "corrupt download." Try downloading the archive again from the original source. Deathstrike2-Payback-Chapter-01.zip
The .zip format is used to compress multiple files into one for easier sharing and downloading. How to Open and View the Contents