If the ZIP contains many .txt files, you may need to use a dedicated viewer or combine them.
: Most users report these ZIPs contain harmless text files or images of book pages.
: You can extract the files and then use tools like Smallpdf to convert them into a more readable PDF format.
: Use the Files app on iOS or Android to extract the contents. Read the book :
Some users rename the extension to .epub or .cbz if the internal structure supports it.