File type

.zip or .rar is an archive file; to decompress it use winrar or 7zip.

.pdf The PDF file type is primarily associated with 'Acrobat' by Adobe Systems Incorporated. Adobe Acrobat is a family of computer programs developed by Adobe Systems, designed to view, create, manipulate and manage files in Adobe's Portable Document Format (PDF).

.djvu  A DJVU file is a compressed image format developed by AT&T and marketed by LizardTech. It is designed to allow content developers to scan high-resolution color pages of books, magazines, comics, catalogs, etc. and publish them on the web. 

.epub  An EPUB file is a digital ebook saved in the EPUB format, an open XML-based format for digital books and publications. It provides a standard digital publication format for publishers and consumers.

 winrar:  https://www.rarlab.com/ 

 7zip:  https://www.7-zip.org/

to read .pdf .djvu .epub ; download

Sumatra PDF: Free PDF Reader

https://www.sumatrapdfreader.org/

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