Well, I did take some files from the archives which actually loaded fine on my origin 1.4.1. The xml elements are recognizable as such but there is some header information and stuff in elements called "chunck data" which are quite mysterious. As I've read that corrupted files might brick the origin I'm a bit hesitant to just try and see what happens.
If Philippe or anyone at arturia is still monitoring: It would be great if we can get a spec posted and/or some way to validate the ogs outside of the origin.
Anyway, this has become somewhat less urgent for me as I got all the sequencer knobs working again and I've got several other "projects" that need my attention.