I can't seem to find any native controller support for The Witcher (Enhanced Edition Director's Cut for the PC). Is there any good alternative to emulate controller support for this game?
The Witcher doesn't have native controller support. In order to use a controller with this game you will need to use an application like XPadder/Pinnacle Game Profiler/Joy2Key to bind your controller axis and buttons to mouse and keyboard actions.
I have never used it but Pinnacle Game Profiler has a section on their website to download pre-configured profiles for the Witcher which might provide you with a good place to start if you choose to use Pinnacle Game Profile (which is not free).