title: Find out if an executable is installed and programatically open it
body: <p>I have a code that when I say open a program, it will open. But, what if that program doesn't exist? How can I make my code tell me it doesn't exist? And, how can I make my code open an alternative program if it exist?</p>
  
  <pre><code>case "open microsoft word":
                  System.Diagnostics.Process.Start(@"C:\Program Files\Microsoft Office\Office15\WINWORD.exe");
                  JARVIS.Speak("Loading");
                  break;
  </code></pre>