Microsoft.Office.Interop.Word.Application wordApp = new
Microsoft.Office.Interop.Word.Application();
wordApp.Visible = true;
d = wordApp.Documents;
aDoc = d.Open(ref oFilename, ref nil, ref readOnly, ref nil,
ref nil, ref nil, ref nil, ref nil, ref nil, ref nil, ref nil,
ref isVisible, ref nil, ref nil, ref nil, ref nil);
For moving and change size of the Word window using this code:
set Microsoft word bottom equal to the top position of application
aDoc.Activate();
aDoc.Application.Width = this.Width;
aDoc.Application.Height = this.Height;
aDoc.Application.Move(this.Left, this.Top);