Uhh this program is confusing, it won't let me open sounds
Open it up, click the icon that is a folder with a green arrow over it, navigate to your team fortress 2 content.gcf file in your steam/steamapps directory, navigate to the 'vo' folder in tf/sound, once there, you'll see a 'taunts' folder and a bunch of .wav files below (Starting with the Announcer's sound files being that it's sorted by filename), on the left of the GCFScape window, you have the navigation bar, and on the right is where you can double click .wav files to listen to them or drag and drop them onto your desktop