files in xdb format contain sound settings and THE NAMES OF THE SOUND FILES YOU NEED
for example, in the folder \Sounds\_(Sound)\Creatures\Haven\Peasant there is a file happy.xdb, and it says
<uid>8E412366-DB9F-4586-8635-32B090865984</uid>
which means the sound file in sound.pak is called 8E412366-DB9F-4586-8635-32B090865984, if you add .wav at its end it becomes a regular sound file