Creator codes now dead
Thus, an application in Snow Leopard cannot use a creator code attached to a document to bind that document to itself.
Snow Leopard Snubs Document Creator Codes
Well, as far as I'm concerned, good. I don't think I've opened a document by double-clicking on it in years - the unpredictability of 'which of the 4 text editors I have installed is going to open this time?' has led me to stick a TextMate icon in my Finder toolbar, and I open all text files by dragging them to that icon. Likewise, I have an Acorn icon there I drag images to. For other file types, I tend to drag them to the Dock. Why on earth would I want the preferred text/image editor of whoever originally wrote this file to affect what application I use to edit it?
Now I might be able to cure myself of the habit, and go back to trusting my computer to open files in the apps that I actually use.