For that to happen, the software needs to have some sort of libraries and API files released by the developer, otherwise it won't be possible. Just as I thought, the official website of Docx2Rtf doesn't exist anymore, therefore it's impossible to say if what you need would be possible with this software.
However, there are other developers available that have API code available for your needs. One is xceedsoftware that has a page on the Github with the modules and API you want to implement in NET Framework.