How to I include "Microsoft.WindowsMediaServices.Interop"??

Question

I am using VS 2015 and trying to build a C# application that allows users to create playlists of training videos and play.

I found code that looked like a great starting point - in Windows Dev Center Developer Resources - the page title is "Using the Server Object Model to Define Playlists."  That page and its sub-pages look great.  

The code uses 2 library references:
using interop_msxml
using Microsoft.WindowsMediaServices.Interop.

Both of those reference names showed up as not existing in the namespace.

I was able to resolve the \error for interop_msxml by adding a reference to the project for Microsoft XML, v6.0 (in the COM group of the "Add Reference" Dialogue Box).

I have not been able to resolve the error for Microsoft.WindowsMediaServices.Interop. I have been searching under that name, and under the class name "WMSServerClass" to try to find out what reference I should add.

PLEASE - Can anyone explain to me how I can use "Microsoft.WindowsMediaServices.Interop"??

As mentioned, I am using VS 2015.  My computer is running Windows 7, and my hope is to have my application run on all operating systems from XP to Win10.

I am a .Net newbie - and running into obstacles like this is really frustrating (as much as I love the framework - it is really big and finding the classes I need is really difficult.  (Is there a directory of classes somewhere that i have not found??)

Thanks