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d3d_autotransparency
If this flag is set, the color of the upper left pixel of true color textures is taken as transparency color, instead of black. This way the background of sprites or skins can be set to any color, thus avoiding the black seams visible by antialiasing to a black background.

Range:
on - the color of the upper left pixel is the overlay color
off - black (0,0,0) is overlay color

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