1. On the desktop, double-click My Computer.
2. From the View menu, choose Options.
3. Select the File Types tab.
4. Select AutoCAD Drawing from the list, and then choose Edit.
5. In the Edit File Type dialog box under Actions, select Open, then choose Edit.
6. In the "Editing Action for type" dialog box, clear the Use DDE check box.
7. Choose OK, then choose Close twice.
You can now open more then one AutoCAD Release 14 drawing from Windows Explorer.