I forgot to add that the poser files I had zipped and burned to CD were compressed in Poser before being zipped.  I don't know if that made a difference or not, but I've never tried it again.

You could always compress your files in Poser and save them on an external hard drive without zipping them.

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi