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I'm trying to write an application that controls the system volume on Windows 7 but I can't find any documentation on where IAudioEndpointVolume is located in the .NET class library. What is the full path?
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IAudioEndpointVolumeis part of the operating system API's, it's in a C++ dll. It doesn't exist as part of the .Net BCL. You could P/Invoke into it if you wish, but there isn't a .Net wrapper unless someone else has written a 3rd party version.The Core Audio API (where IAudioEndpointVolume is located) is not native to the .NET Framework.
However, you can use this Codeplex project, which provides .NET wrappers for the Core Audio API.