Help me out with my iPad!

Hey y'all I got an iPad for college and was pirating some books on it. I just pirated my chemistry book but when I tried to open it it gave me this error message http://imgur.com/7vGZk8M

What app do I need to open up the book?

 

Perhaps its the formating of the book. Kimdles can only use .mobi files i think ipads can use .pdf and something else. You should google what files are compatible with your ipad. Then you can use calibre to change the file type

 

mb try download a ,7z file reader from the app store?

 

Thanks for your help guys. I downloaded an opener from the app store, worked fine. Haha $800 worth of books free

 

Yea 7zip just needs a special opener. What sire did you use?

 

Just downloaded the first free unzipper on the App Store and it worked