How do I reset an app's icon so the app will launch?

In a test user account, everything is fine. In my main account, however, the Photoshop icon is now a blank document icon and Finder says it is a Microsoft Word document rather than an application. If I double click on a Photoshop data file, Photoshop launches and runs just fine. I've booted from my install DVD and repaired the disk and permissions. I've tried renaming home/Library/Cache and home/Library/Preferences to no avail. Throwing away Photoshop and reinstalling from the CD has no effect. Something is very strange with my main user account. Anyway to set it right short of backing everything up and moving to a new user account?
1.67GHz 17 inch Powerbook Mac OS X (10.4.5) 2 GB

Lynn
Find out what your user id (UID) is by opening the Terminal (from /Applications/Utilities) and typing idPress return, and the line you get back will have your uid as the first item. Let's suppose it is 501.
Then go to /Library/Caches/ (that's the top-level Library, not the one in your home folder) and look for a file "com.apple.LaunchServices-014501.csstore". Trash it, or move it to the Desktop. Then, go to ~/Library/Preferences/ (that is the Library in your Home folder) and Trash or move "com.apple.LaunchServices.plist". Log out and log in again: has this made a difference?
This should allow you to launch Photoshop by double-clicking a PS document. If you still can't launch the application directly, post back.
You may also want to check this article on Adobe's support site: http://www.adobe.com/support/techdocs/329996.html, although I suspect the problem described there would affect all accounts, not just one.

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How do I reset an app's icon so the app will launch?

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