Thank you for the suggestion. Unfortunately, I've tried this and it does not work. When I use "Open With" to tell Windows to open a file with C:\Program Files\Microsoft Office\OFFICE11\POWERPNT.EXE, it ignores my instruction and opens the file with PowerPoint 2010.

Also, your post mentions icons in a way that seems inconsistent with my experience. My PPT files display the PowerPoint 2003 icon, and my PPTX files display the PowerPoint 2010 icon. Nevertheless, Windows opens both file types with PowerPoint 2010.

-TC