QuickDraw 3D: Requires SimpleText 1.3

I just installed QuickDraw 3D on my computer. When I try to open one of the sample files from the QuickDraw 3D folder, I get an error message that says, "SimpleText cannot display this kind of document." What can I do?
QuickDraw 3D requires version 1.3 or newer of SimpleText to display 3D documents. The QuickDraw 3D software includes version 1.3 or newer of SimpleText.

Be sure to remove any older versions of SimpleText or TeachText from your hard disk. This will ensure that you are opening your QuickDraw 3D documents with version 1.3 or newer of SimpleText.
Published Date: Feb 18, 2012