If you need to import Sketch Up files into Rhino, you need to do the following:
1. In Sketch Up Export your file (3D model)
2. Use the file extension 3D Studio (*.3ds) (Select this from your file type tab)
3. Save the file on your desktop.
4. Open Rhino and go to File Tab click on Import then
5. Look for the file but make sure that you select Files of Type 3D Studio (*.3dm) to find the file on your desktop.
6. Click on the file and press open.
I hope this helps.
Prof. Valdez