How widely supported is x2 blending?

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Just fixed up my bowling alleys so that they're ready-ish for a final render, and I was contemplating download the latest version of Gile[s] so that I can use x2 blended lightmaps, but I'm not sure how widely supported they are. I suppose if I'm going for a CD-only game I could include lightmaps for both, but I still may want to make a download-only version for broadband users and I'm not sure how well-supported x2 blending is. What kind of cards can't do it?