I think it was up to version 1618 that PowerDVD worked with 3D Vision Discover (selecting NVIDIA 3D Vision Ready Monitor).
Starting with version 1905c, when you try to select this option, it says "The content or display doesn't support this mode" and it reverts to the previous setting.

I know there's the "anaglyph red/cyan" setting, but choosing the 3D Vision option produced an output that looked MUCH better due to the color filters closely matching those of NVIDIA's Discover glasses. Using the built-in anaglyph setting, the 3D effect is OK, but everything looks greenish and washed out.

It would be great to keep this option available, as I have an LG 47" 3D TV connected to my PC but I still use the Discover glasses for casual 3D viewing on my non-3D desktop monitor.