You need to place the obp file into the /presets/objects/user directory within the Bryce file structure. Then click on the triangle next to create to open the object window. At the bottom of the window there is the word installed, click and select User and you should see all the smartpipe variants in a smartpipe category.

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