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How Can Common dialogs be extended like the one shown below ?

The XbpFileDialog object references an encapsulated API object, which only provides few properties and methods. It's very hard to extend this. Take a look at this article:

http://www.codeproject.com/Articles/195 ... g-the-easy

There is a link in this article, which points to an older MSDN-article about how to do it. To be honest - I wouldn't.

It may be easier to create an own file dialog. All the functions you need a availabe, Directory() maybe the most important function.