Just tried the same procedure with the ReLive drivers. cannot use older OpenCL files
Can confirm that "soft rollbacks" no longer work in general - even for DirectX/OpenGL DLLs (atiumdag.dll, etc).
According to Process Explorer it's still loading them from C:\Windows\System32\DriverStore\FileRepository, even if I put them in the same directory as the game EXE.
This is an absolutely essential feature to have in order to fix regressions (such as ground textures in Star Wars Battlefront II, which have been broken for over a year).