Oops. :)  I swear that I read 64-bits per channel.  Now you know what to use: openEXR.

Still seems odd, as you note, to require such high 'resolution' images for on-the-fly rendering.  One would think that on-the-fly would be better served by 8-bit per channel.  Maybe this is a factor of the engine they are utilizing for render (?).  Do they give a file format support list for the images?

C makes it easy to shoot yourself in the foot. C++ makes it harder, but when you do, you blow your whole leg off.

 -- Bjarne Stroustrup

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