How to read MOBI and EPUB files on a computer How can I read a book that I purchased from a website immediately on my computer? Be aware that these guidelines are only a starting point because technology is always evolving. How to open .Mobi format First Download and Save the .mobi file in your pc. Then Unzip the .mobi file. Right click the zip file and select ‘Extract all…’ and select the folder destination that you want to extract the files. Download and install Kindle for PC app from amazon. (sign up for a free Amazon account.) The ebook should open if you navigate to the saved mobi file, right-click, and choose "Open with" > "Kindle for PC."