How to: Programmatically Open Existing Documents
The Open method opens the existing Microsoft Office Word document specified by a fully qualified path and file name. This method returns a Microsoft.Office.Interop.Word.Document that represents the opened document.
Applies to: The information in this topic applies to document-level projects and application-level projects for Word 2013 and Word 2010. For more information, see Features Available by Office Application and Project Type.
To open a document
To open a document as read-only
Call the Open method, supply a path to the document, and set the ReadOnly argument to True in the method call.