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ApplicationClass myWordApp = new ApplicationClass();

myWordApp.Visible = true;

object wordPattern = @"C:\PrVorlage1.dot";
object newDoc = false;
object documentType = 0;
object visible = true;

Document aDoc = myWordApp.Documents.Add(ref wordPattern, ref newDoc, ref documentType, ref visible);

//aDoc.Activate();

object linkToFile = false;
object saveWithDocument = true;
object range = aDoc.Paragraphs[8].Range;
  
myWordApp.Selection.InlineShapes.AddPicture(@"C:\ForumPic3.jpg", ref linkToFile, ref saveWithDocument, ref range);					

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object index = 1;
aDoc.Shapes.get_Item(ref index).Delete();					

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object indexTextBox = 1;
Shape wordTextBox = aDoc.Shapes.get_Item(ref indexTextBox);
wordTextBox.Fill.UserPicture(myImage);