Because I don't have B6 installed I use the DAZ studio bridge. I create cube primitives in D|S and apply the image textures I want to them and then I bridge it over to Bryce. This puts them correctly into the Pic Editor and can be applied to objects in Bryce as usual. Then I delete the D|S cubes.

Ypu can also use a modeler the same way and export to .OBJ/.MAT which also loads correctly in the B7 Pic editor.

MacPro/10.6.8/B7.1.0.109