I am trying to Preview Word Documents in a RichTextBox. The code works fine, with the following two exceptions.

(1) When I open the file, I get the following Error Message Dialog:

File in Use

ABCFile.doc is locked for editing

by 'Username'

Click 'Notify to open a read-only copy of the document and
receive notification when the document is no longer in use.

The only one using this document is my program!

(2) Even though I have set appWord.Visible = false, Word still shows up.

C# Code:
Word.ApplicationClass appWord;
Word.Document docWord;
Object filename = path;

Object ConfirmConversions = System.Reflection.Missing.Value;
Object ReadOnly = true;
Object AddToRecentFiles = false;
Object PasswordDocument = System.Reflection.Missing.Value;
Object PasswordTemplate = System.Reflection.Missing.Value;
Object Revert = System.Reflection.Missing.Value;
Object WritePasswordDocument = System.Reflection.Missing.Value;
Object WritePasswordTemplate = System.Reflection.Missing.Value;
Object Format = System.Reflection.Missing.Value;
Object Encoding = System.Reflection.Missing.Value;
Object Visible = false;

Object saveChanges = false;
Object originalFormat = null;
Object routeDoc = null;

appWord = new Word.ApplicationClass();
appWord.Visible = false;
docWord = appWord.Documents.Open(ref filename, ref ConfirmConversions, ref ReadOnly,
ref AddToRecentFiles, ref PasswordDocument, ref PasswordTemplate,
ref Revert, ref WritePasswordDocument, ref WritePasswordTemplate,
ref Format, ref Encoding, ref Visible);
docWord.ActiveWindow.Selection.WholeStory();
docWord.ActiveWindow.Selection.Copy();
IDataObject data = Clipboard.GetDataObject();
_RichTextBox.Rtf = data.GetData(DataFormats.Rtf).ToString();
docWord.ActiveWindow.Close(ref saveChanges, ref routeDoc);
appWord.Quit(ref saveChanges, ref originalFormat, ref routeDoc);