If you are trying to convert PDF, PowerPoint or MS Word document into PUB format file then you can rely on Pub Crawler which is an open source application. It is free from all the hassles related with installing Microsoft Word application on your PC. Simply search Google for 'pub crawler PowerPoint'. You can easily open various PUB files of Microsoft Word format, with the help of Pub Crawler, and easily view all types of PUB format files.
Another tool for viewing multiple Microsoft Word documents is Microsoft Publisher for Mac which offers the feature of the preview pane in the main window of Microsoft Word. To view other types of document, you can right click on the title and select 'view' option from the drop down menu. This is another useful tool for viewing various type of document in Microsoft Word. If you need to view many types of document then you should install Puba PDF Viewer on your MAC. Puba is also a free download from the official website of Microsoft.