HTML to Word convertion in Rails

Rails version: 3.2 Ruby version: 1.9.3

In my Rails app, there is an HTML file which I would like to convert to a WORD format without loosing its structure / design. I have used htmltoword gem. But the HTML is not rendered exactly alike in to the Word file. It has got design issues. It is not interpreting tables, ul li etc correctly.

So, I would like to have better suggestions for implementing this feature. Thank you.