¶ You can view most documents with no opening a system to do it. At the desktop, highlight the icon and then tap the Space bar - a wonderful way to preview images, but also wonderful for Workplace documents, PDF files, movies, sounds and so on. Scan with a second system. Following scanning with your first antivirus plan, uninstall it and install a second plan. You can use two different free of charge ... app on your iPad, tap an ePub file to open it. When the Dropbox app displays the Unable to View File" message, tap the Action menu icon in the upper appropriate corner of the iPad's screen.