How do you manipulate a MS Word document (.docx) programmatically using vb.net?

Question

I am trying to read from a .docx file (MS Word 2013) using vb.net and find and replace multiple words within the same document. I do not want to make use of a plugin or add-on within vb.net but rather program this myself.

Which libraries or references within vb.net will give me the ability manipulate MS Word documents with the .docx file extension.

Any related vb.net code for Visual Studio 2013 would be greatly appreciated.

I have found the following related information (https://support.microsoft.com/en-us/kb/316383) although I am finding difficulty in adapting it for Visual Studio 2013.

Below is a list of COM references directly from Visual Studio 2013 and the only similar option with reference to the above link seems to be the checked item in the screen print below:

Answer 1

Seems that after a bit of "connecting the dots" from everyone's commentary (thank you) I was missing an imports reference that works with the "Microsoft Word 14.0 Object Library" associated with MS Word 2013.

With reference to https://support.microsoft.com/en-us/kb/316383, the imports reference that I found was adapted from the question: How to load Word Object Library properly in Visual Studio Express i.e. adding the following to the top of the object class solves this question:

Imports Microsoft.Office.Interop