I found a solution. Here it is for anyone else who has this issue. It can be found in this thread on Chaos Group Forums.
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Originally posted by Raven
Hi Palosanto
If you want to remove the alpha and see the background in photoshop do the following.
Open the image in photoshop.
go to the Layer menu -> Layer Mask -> From Transparency.
This creates a new layer mask.
Now delete the layer mask in your Layers panel.
Your layer should now have no transparency and you background should be visible.
It is one of the tricks with image formats that don’t use a separate alpha channel, but rather transparency values for each pixel."