Changing the application that a file type opens with

I have MSFT Excel and Subethaedit installed...
I want Subethaedit to open all "*.spad" files
I go to "Get Info" then go to "Open with:" then choose Subethaedit
Then I press "Change All...", a dialog pops up and asks if I want to apply the change to all documents of the form "*.spad", and I answer "continue" and then...
It ignores me; it drops Subethaedit from the list of apps to "Open with" and doesn't change the default format.
How do I force the type to change to the app I want? Is there a text-file I can munge somewhere?
mac mini Mac OS X (10.4.8)

Hi, thechao. Welcome to the Discussions.
It's possible your launch services database is corrupted. See my "Resetting Launch Services" FAQ. Then try the procedure you defined earlier, which is also described in "Mac OS X 10.4 Help: Changing the application that opens a document."
Good luck!
Dr. Smoke
Author: Troubleshooting Mac® OS X
Note: The information provided in the link(s) above is freely available. However, because I own The X Lab™, a commercial Web site to which some of these links point, the Apple Discussions Terms of Use require I include the following disclosure statement with this post:
I may receive some form of compensation, financial or otherwise, from my recommendation or link.

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