Access sharepoint version history in word

Question

Is there a way to access the shrarepoint history table in word (or other office appliations) via a programming interface?

Challenge:

Generate save published versions of word documents in sharepoint to PDF.

I use a C# application for this.

Solution so far:

Open a word document from the sharepoint server works.

I cannot find a way to open the sharepont history from a word Document object.

I have not found a way to get a list of history items.

In word itself, I have to go to file->History to see the different versions.

I found a versions list, but versions are not the history.

public static void test()
        {
            Microsoft.Office.Interop.Word.Application ap = new Microsoft.Office.Interop.Word.Application();
            ap.Visible = true;
            ap.Documents.Open(@"\\dms\DavWWWRoot\sites\Project\Document1.docx");
            try
            {
                // This question: Retrieve puslished versions
                // TODO: ExportAsFixedFormat
            }
            finally
            {
                ap.Documents[@"Document1.docx"].Close();
            }
        }

I could not find it when searching the internet for a solution. 

Many thanks in advance for any help,

Pieter