help with audio on ISO files in VLC Player

I recently downloaded a ISO file and Tried to play it on VLC media player. The pisture worked but I didn’t get any sound. I raised the volume full blast.set system volume all the way up, and checked to see if my speakers were properly plugged in. Everything seemed ok so I tried playing an avi file and that got audio and video so I don’t know what’s up with the ISO file.

Can some one tell me how to fix This problem or tell me of a media player that can play both audio and video instead of just the picture when I play ISO files?