Viewer Cola

Viewer Cola is a very useful piece of that makes it enables you to read everything from documents, PDFs, eBooks, Excel sheets, all the way up to iCalendar, vCalendar, image files and other DrQuantz native files (Dashboard, Report, and Snap) as well.
Also worth mentioning is the fact that this apparently simple universal document viewer also comes with support for collaborative viewing.

Handy application that is easy to install and just as easy to get to grips with

Its installation is as straightforward as you can expect from such an application, but you will be prompted to register the product and login when you first start it.
In terms of looks, things might seem a bit familiar since it employs a typical UI with a layout that is bound to remind you of Microsoft Office products. basically, all the controls and features are easily accessible via a typical ribbon toolbar. That said, it's quite clear that you should encounter no problems while working with this tool, regardless of your computer experience.

Straightforward set of features and customizable UI

From the File Viewer menu, you can perform basic tasks such as opening new files, saving or printing them, from the Interactive Form section, you can import or export data, and from the Print Preview section, as its name suggest, you get to see how your files will look like before printing.
It's also worth pointing out that the application provides you with a few options to change its interface's looks and colors from the last section called Skin Gallery.

All in all, not a bad universal document viewer

To conclude, if you're looking for an application that allows you to view a wide array of files and formats and packs simple collaboration-related features, then Viewer Cola is definitely worth a try.