It would be nice if I could write plug-in data directly to a
File3dm object. Now I can only remove and read plug-in data in the 3dm file.
Also, it would be nice if you could actually do something with the data read. Now the
File3dmPlugInData only contains the plug-in GUID.
A quick scan of
ON_BinaryArchive header seems to suggest that the C++ SDK is far more capable here.