Well, I've never really tried looking as I'm not sure what the reason would be? .br5 to renderman conversion? knowing that bryce save textures into the files, it's diffciult to just decode, for example an area that is a large chunk of hex could be texture info versus geometry info or areas of the data could be obfiscated. You really need to ask DAZ if the format will go open source, provide a good argument as to why you want it to (for example if you wanted to use aqsis or similar)

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Toolset: Blender, GIMP, Indigo Render, LuxRender, TopMod, Knotplot, Ivy Gen, Plant Studio.