title: How to open associated files in the same instance of an application
body: <p>I want to open files, which are doubleclicked in Explorer, in the same instance of my .Net application, e.g. in a new tab. How can I do this?</p>
  
  <p>For now each file starts new instance of my application. Many programs can open files in the same instance, for example, Opera and Notepad++, so there is an easy way for sure.</p>