For Nikon D50 cameras Adobe Creative Suite 6 does not read "As Shot" white balance data whether it's specified or not. It defaults to "Automatic". We have the problem only for Nikon D50 and only in Photoshop CS6, Adobe Camera Raw 7.3 and Photoshop Lightroom 4. (Not in CS5. Not for Nikon D5100 or D7000 or Canon S95) .
There is a more detailed posting at photoshop.com.
Lightroom 4.2 / ACR 7.2: WB "as shot" does not read the WB of Nikon D50 NEF, defaults to "automatic"