Thank you for the interest in out RadWordsProcessing library. Indeed, it allows you to easily create or convert document to Ms Word (Docx format). You can check the getting started article
for more information.
However, we need a bit more information about your scenario to be more specific? In which format is the document you want to export?
Is the documentviewer you are referring to, the System.Windows.Controls.DocumentViewer?
Check out Telerik Analytics, the service which allows developers to discover app usage patterns, analyze user data, log exceptions, solve problems and profile application performance at run time. Watch the videos
and start improving your app based on facts, not hunches.