Replace "Drop down list content control" by string

Hi All,

We have word document in which a drop down is present. Drop is created using “Drop down list content controls” present in developer tab of word document. Problem is we are unable replace it by string. When we read the document we are getting a symbol “┴” instead of drop down when we print it in message box. When we generated this symbol and tried to replace this drop down text we are getting Error like “Cannot replace hexa decimal characters …”.Did anyone has any idea to replace such drop downs in docx file.