Ну, вы можете использовать Microsoft.Office.Interop.Word
Microsoft.Office.Interop.Word.Application app = new Microsoft.Office.Interop.Word.Application();
Documents docs = app.Documents;
Document doc = docs.Open("C:\\users\\Test.docx", ReadOnly:true);
Table tbl = doc.Tables[1];
Range rg = tbl.Range;
Cells cells = rg.Cells;