NirCmd Command Reference - muteappvolume

muteappvolume [Process] [mute mode] {Device Name/Index}
Increase/decrease the volume level of specific application under Windows 7/Vista/2008.
In the [process] parameter, you can specify the .exe filename (For example: Firefox.exe, iexplore.exe, wmplayer.exe), or full path filename (For example: 'F:\Program Files\Internet Explorer\iexplore.exe') or the process ID (For example: /3426)
You can also specify 'focused' for this parameter, if you to want to mute/unmute the volume of the focused application.
You can also specify 'SystemSounds' for this parameter, if you to want to set the 'System Sounds' volume.
The [mute mode] may contains one of the following values:
0 = Unmute
1 = Mute
2 = Switch between mute and unmute.
The {Device Name/Index} is optional parameter. If you don't specify it, the default output device is used. You can specify the device index as numeric value (0 = first device, 1 = second device, and so on) You also specify the full device name, like Speakers or Headphones. In order to find out what sound devices are available in your system, use the showsounddevices command.
Examples:
muteappvolume iexplore.exe 0
muteappvolume wmplayer.exe 1 Speakers
muteappvolume /1275 2 1
muteappvolume Firefox.exe 1

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