Windows 7 - Program not appearing in Volume mixer

Hi, I've searched around on the net for anyone else that might have this problem, but no luck.

The program is a game called Shores of Hazeron, the sound works fine, apart from the fact it isn't showing up in the volume mixer, and the game doesn't have any volume controls in its in-game settings. Which can be a bit annoying when you have the rumbling of a starship in your ear when you're trying to listen to music.

Anyone have any ideas on how to get this working?

bump! im having the same problem, i installed a new sound card, ASUS Xonar DG. I used to be able to control my games and applications sounds individually in the mixer, but now it doesn't show any programs at all except for Skype when I'm using it.