Components.bmp background transparency colour?

Microsoft must have their own standard for pure black then (wouldn't surprise me...). Paint tells me that the colour I used has R, G and B values of 0, 0 and 0 respectively, but the components I'm adding all have solid black backgrounds.

It's definately black - open up the components.bmp and every component has a black background.

However, I've just discovered that Microsoft Black (tm) is indeed different from everybody else's black. As well as Red, Green and Blue, they've added Hue, Saturation and Luminescence. Their black starts off with a Hue of 160 - change this to 0 and whaddaya know the background becomes transparent.