Check your Video settings in the Game.
It's under options.
Is it set to use low res?
That will cause the images in the lowres folder to over ride the ones in the dat.
If you must run at lowres, you can extract the images from the dat and place them in the lowres folder.
You could even reduce the size of them before placeing them there if need be.
If they are 1024 x 1024 reduce them to 512 x 512
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