Unlike .exe or .scr files, an .epub cannot "run" itself on your computer.
Files with randomized, non-descriptive names like are frequently found on third-party download mirrors or "shadow libraries."
If you’ve encountered a prompt to "Datei herunterladen qgef0pnkns5s.epub" (Download file qgef0pnkns5s.epub), you might be wondering what it is and, more importantly, if it’s safe to open. Randomly generated filenames like "qgef0pnkns5s" often appear on file-hosting sites or as the result of automated download links.
Always check that the file ends strictly in .epub . Scammers sometimes name files book.epub.exe to trick users into running an executable program. How to Safely Handle the Download
Safety First: What You Need to Know About "Datei herunterladen qgef0pnkns5s.epub"