These are 3d party modified drivers. Modified drivers simply means that the author takes official or beta drivers from the manufacturer and starts to tweak them for either better image quality and or performance. Please bare in mind that the driver manufacturer never supports drivers like these. You use them at your own risk. For more information and dialog about these drivers I suggest you visit our forums where a dedicated section can be found on modified drivers.
These drivers are based on ForceWare 67.66 Changes (67-65 to 67-66) and mainly targeted at the GeForce 4 series.
* Added new OGL tweaks and System Tweaks