I have made a very simple program in C#. When I double click the compiled exe, it executes and works. When I run the exe from the command prompt, it does absolutely nothing. I have tried executing it from an Administrator command prompt also. I am on Windows 7. This is very frustrating. The only command the program executes when ran is SendMessageW(Process.GetCurrentProcess().MainWindowHandle, WM_APPCOMMAND, Process.GetCurrentProcess().MainWindowHandle, (IntPtr)APPCOMMAND_VOLUME_MUTE);