the same is for Preview and inkscape and numeroous other applications
there is simply no other way than to resave it in illustrator,
c4d opens it but that only works in matters of 3d construction
if you need to make it up graphically you are stuck.
Preview usually opens any kind of ai. just not the one created from rhino mac
the same is for Affinity Designer, it opens any kind of ai,
even whole pdfs with pages into layers
but they all give up on this ai created by rhino. i also tried an online converter…
it spat out the listing of the commands implemented in the header of the file
or so i guess. but the pdf was not usable…
and yes printing a pdf from rhino is really not usefull…
it converts lines and solid hatches into segments…
like autocad doing a pdf… its just not possible to reedit that
without having to tear the whole document apart…
i guess its not affinity or preview, its how rhino saves it that only adobe illu can open it.
really not usefull for people who dont own or rent Adobe stuff!
maybe Rhino could get an svg exporter implemented…
at least check how the ai is being created if there is somebody out there reading this