File preview control in C#

Hi,

 How can I preview existing file (such as pdf, git, txt, doc etc) in winform, similar to what win explorer is doing? I've seen:

http://www.codeproject.com/Articles/37787/Document-Preview-Application

But it is not generic and very slow. Is there other way (I thought that PrintPreviewControl could do it but it can't). 

I'll appreciate help

Thanks.

Gil.