title: Open specific files with my c# application - like opening .doc files with Word
body: <p>You can set <em>Windows</em> to open .doc files with Word or another application. How can I create such a c# applications, which can handle, if for excample I open a <em>.txt</em> file with that application? So the plan is: There's a <em>information.kkk</em> file wich is a text file and there's a number in it. I want my c# application (<em>Visual Studio 2010</em>) to receive that number if the file gets opened by it.</p>