If you're using at least Windows 7
Nircmd is a free little utility that expands what you can do from the command line.
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Added setdefaultsounddevice command (for Windows 7/Vista/2008 only), which allows you to set the default sound device.
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I have the same setup as you, and the same frustration.
So I installed Nircmd and created a batch file. Here's a good little tutorial...
http://blog.nirsoft.net/2011/06/29/3...ws-7vista2008/
Last thing I did was create a Catalyst Control Center (Radeon cards only) profile for Extended TV, and have it run the batch file when activated. I created another profile for ComputerOnly, and have a second batch file for switching the audio back to the sound card.