"We stopped shipping that DLL due to intractable issues found with Windows Explorer. This was the cause of issues such as files appearing locked and not being able to be moved, renamed or deleted without areboot"
They are saying if you had photoshop 7 and upgraded to CS2, it works but if you uninstall it, it removes the .dll or if you never had the prior version installed in the first place, its not there. There is a patch but the first one I found, the link is dead...Im still lookin