You'll want to work in tga. Save in 32-bit (24-bit color + alpha) and make sure its edges are a power of 2: 8 64 128 256 512 etc
Unfortunately those tools only convert square TGAs to BLPs (but convert non-square BLP->TGA just fine). Wish I knew of one that could convert rectangles.
gimp 2.2 is a good free tga editor
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