title: How to run a file (e.g. AVI) from a C# app
body: <p>I would need my app to just run any file in a player/browser that Windows use (so for AVI it would use e.g. BSPlayer or whatever has the PC set etc.).
  All I found was related to EXE files.</p>
  
  <p>EDIT: I do not mean just multimedia files. I mean also TXT (where I would expect Notepad to open etc.)</p>