How to add cover page at front without any change in formatting of document

I am trying to add cover page in front of a word document (.doc, .docx, .docm). And I don’t need the formatting of the document to which I am adding a cover page to get changed by even a single pixel. The formatting of the document should remain the same as before.

So please let me know how to achieve this functionality.

@MINDNOIDA

Please ZIP and attach your input and expected output Word documents. We will then provide you code example according to your requirement.