title: Qt:Where to find the .pro file when developing with visual studio
body: <p>I want to add sound to my program so I need to add header file “QSound”.</p>
  <p>To add the header file, I need to modify the .pro file.</p>
  <p>The problem is, I use visual studio to develop projects, so I can't find the .pro file.</p>
  <p>I am so confused.</p>
  <p>Thanks for your help!</p>