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How to get message from Windows to actually running application in WPF?

Posted By:      Posted Date: September 19, 2010    Points: 0   Category :WPF

I spend around few hours to find something about my issue on Internet. But I have no idea what to write in Google... :/
So I thought maybe it will be better to write here.
  I wrote an application which can save and open it own files. Then I added special registry key and now when I double-click on a file associated with my application, Windows (OS) opens my application and load the file. Most application work like this and thats OK.
But what I want to do?
I want my application to be opened just once. So when I double-click on a file the application will start running and load the first file. But when I double-click on second file (during my application is already running) windows will open second application. And I want to load this second file to already running application. What should I do??

PS - I am writing WPF application in Visual 2010 with .Net4.

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