Textures with 2048x2048

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i have Problems with big Textures. B3D resizing this after Load to 512x512.
I have a GF 6800 GT (Can load Textures to 2048x2048), but B3D can' not load this without resizing.

Is it a B3D or DX 7 Problem ? is there a solution? (no Tilemap Terrain)