Just to be clear, there is no documented or supported way to do this. If you create some solution through reverse engineering, there's no guarantee it will work in all cases and may not work on all relevant versions of Windows. May I ask again, why do you need to? We'd like to understand the scenarios in case there are other improvements we should make in this area the future. Frank Yerrace Microsoft Corporation This posting is provided "AS IS" with no warranties, and confers no rights. From: wdmaudiodev-bounce@xxxxxxxxxxxxx [mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Karthik Gurumurthy Sent: Wednesday, June 10, 2009 8:40 PM To: wdmaudiodev@xxxxxxxxxxxxx Subject: [wdmaudiodev] Re: setting audio device as default from the VC++ Thanks guys, I figured it out how to do this. writing to the registry from vc++ will do the work. Karthik SG On Thu, Jun 11, 2009 at 12:01 AM, Frank Yerrace <Frank.Yerrace@xxxxxxxxxxxxx<mailto:Frank.Yerrace@xxxxxxxxxxxxx>> wrote: There is no documented way to do this. My usual follow up question: why do you want to? Frank Yerrace Microsoft Corporation This posting is provided "AS IS" with no warranties, and confers no rights. From: wdmaudiodev-bounce@xxxxxxxxxxxxx<mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx> [mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx<mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx>] On Behalf Of Karthik Gurumurthy Sent: Wednesday, June 10, 2009 1:25 AM To: wdmaudiodev@xxxxxxxxxxxxx<mailto:wdmaudiodev@xxxxxxxxxxxxx> Subject: [wdmaudiodev] setting audio device as default from the VC++ Hi all, How can i set an audio device driver to default from an VC++ program. Karthik SG