There are reasons to use this driver. I've read, that someone has adapted the normal Catalyst AGP 12.6 for his graphic card 4550 AGP. Therefore, the question of the adaptation of the legacy.
Windows 8 starts dmw.exe to slow. Windows Metro Sreen is to see after 20 seconds. The last startup program after 2 minutes. Reason, dmw.exe. It is just only adding the vendor ID.