This is an important question, for me at least. I do a bit of work in the Poser community, I've just upgraded from CS2 to CS4 and uninstalled CS2 already only to find that my brushes, patterns and styles (all very important to be able to continue working) are in a new format called .asl and these are in .psp format.
I really need to get these moved over to CS4. Thanks
Richard
C:\Users\Administrator\AppData\Roaming\Adobe\Adobe Photoshop CS4\Adobe Photoshop CS4 Settings
folder so it didn't matter that I had added all my previous presets to the folders in the main Program Folders, the trick was getting the presets in the above mentioned folders overwriting the ones that were created, as explained above.