If the file fails to open, it may be a "corrupt download." Try downloading the archive again from the original source.
If it contains files, you can view them using any standard photo viewer.
If it is a file (sometimes tucked inside zips), use a comic reader like CDisplayEx or Astonishing Comic Reader . Safety & Best Practices
Right-click the folder and select "Extract All" (Windows) or double-click (Mac) to reveal the internal files.
Always run a virus scan on .zip files from unverified sources before extracting them.
Most likely a collection of high-resolution images (for a comic/manga) or document files (for a novella).
While specific details depend on the platform from which it was downloaded,