title: How to launch a file browser in a Qt application?
body: <p>I want to have a button that, when clicked, launches a file browser (like <kbd>Ctrl</kbd> + <kbd>O</kbd> in Word) and returns the path of the file that user opens.</p>
  
  <p>I know how to make the button, but what should I do in the slot that responds to <code>mouseClicked</code> signal?</p>