Shaders

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What Graphics API do the Squad Series Games use?
Is it DX9 ,Direct Draw ,OpenGL or which one is it?
Knowing this may allow me to choose a different shader maybe that will work here.

Actually it's virtually all GDI+ apart from a bit of DirectX for DirectPlay.

Which would hold true for all of the series.  It's basically just bmp files layered on one another. Up to 24 bit, but not able to use the transparency layer that would be found in 32 bit bmps (or 32 bit png files).

You can sorta do that, but have to account for where things layer, and pay attention to what shades (probably the specific hexidecimal code of the colours). 

Personally speaking I do most of my material in old Adobe Fireworks CS 5, and occasionally in Illustrator, and/or Photoshop.