Join a voice channel from a desktop icon

So, one of my buddies always forgets to join the voice channel we play in when he starts up the game we play.together.

I was thinking about making a desktop icon that looks like this game, but in addition to starting the launcher, it joins a specific voice channel on a specific server. Or just the last channel visited.

Is it possible? If not directly supported, take this as a suggestion.
In the meantime, maybe a .bat file, some script or something? How do I go on about this?