title: Make my program the "Choose Default Program" when opening a file
body: <p>I'm making a music player. And what I basically want to know is how to make your program open a file which was clicked by the user in explorer.</p>
  
  <p>For instance:</p>
  
  <p>I've set my music player to the deafult program for opening .mp3's.
  And when I double click a .mp3 file in my music folder, I want my program to open and start playing that song.</p>
  
  <p>But how does that work?</p>
  
  <p>Thanks in advance!</p>