I don't have a mac  but if i want to import into Bryce...
I open the Bryce program..go to the "create" button when the window comes up..you see a set of commands at the bottom of the window.  I click on "import" and when the browse window opens I navigate to the obp file and select it then hit the ok button on the browse window and it should put it into a window in your create window..so when you select it and hit the little "checkmark" at bottom right..it puts the object in your working window in Bryce.

I don't think your system would keep you from importing as long as your bryce is working.
I hope I didn't muddle that up too much.  :D

 

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