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);

使用此代码移动和更改Word窗口的大小：

将Microsoft字词底部设置为等于应用程序的顶部位置

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);