Is this the X3 book? If so, the path to each thing is shown in the upper right, above whatever is in that group, just below the green border/divider.
For example, the buildings shapes shown on page 88 are in CD3\Symbols\TTF\Building.ttf (those kind of symbols are all parts of fonts)
Another example is the corner borders found on page 152. Those are in CD2\Clipart\Borders\Corners |