MS Web Browser control can be used to display contents of different type of files, including PDF.

The code below uses default Internet Explorer XSLT to convert XML into HTML.

The Windows Shell provides a powerful set of automation objects that enable you to access the file system, launch programs, and change system settings.

The Shell Windows Method creates and returns a ShellWindows object that represents a collection of all of the open windows that belong to the Shell, including Internet Explorer.