Gee, that's a tough one. Maybe you could try using the same ID as the shuttle pic in Nova?
You could also try referring to the Resource ID Guide or running the graphics file through SpacePort which will re-ID things as necessary.
As has been mentioned, shipyard and outfitter pics will be scaled up to fit as the EV/O pics are only half the dimensions of the Nova ones. There will be no problems with the format of the PICTs when running Mac Nova. Is is possible, but highly unlikely, that some of the PICTs won't work in Windows Nova.
(edit) Wait, I guess you're talking about sprites. In that case, do what Josh said.
This post has been edited by Guy : 20 October 2009 - 04:39 AM