MPC-HC host is a tool for instance synchronization. It's may be useful when you want to use multiple audio devices with custom audio channel mapping.
Execute Native Tools command prompt for Visual Studio and call:
cl.exe main.c /link /SUBSYSTEM:CONSOLE user32.lib
Start the tool and it will print it's hwnd on console. Then start MPC-HC executables with arguments:
/new /slave [your hwnd]
Example: mpc-hc64.exe /new /slave 123456
where 123456 is a hwnd
First connected instance will be main, other instances will sync to it.