Hi Larry,
You could open the factory-file?
Normally a hollow object doesn't makes difficults when there is a outer-wall and an inner-wall (like a cup or glass) Then the outside and the inside together represent the enclosed solid body. If it is not so, S3D opens nevertheless - ok, it is not ready to print, but it opens!
However that is the first time, I couldn't open a faulty file like this.
@ Nohands
Have a look to this site:
https://netfabb.azurewebsites.net/
there you can repair your STL for free, it works very fine!
Greetings
horst, GER