Is it possible to make Word 2007 default editor for .doc files if Word 2003
co-exists on the same PC?

Now, when I open a .doc, it still opens in 2003. Unless I already have Word
2007 open. If I have it running, then I open a .doc, it will open in 2007.
But if I just click on a .doc to open it, it still opens in 2003.

How do I get Word documents to open by default in 2007?

By the way, this does NOT happen with Excel files.