On [3uD_hq] … anyone figure this out yet? … if I missed it I appologize … anyway, I've been digging around and found nothing on GOOGLE … no surprise there; however, using DogPile, I came across this: https://www.solvusoft.com/en/file-extensions/file-extension-3ud/

And could "hq" be a processor? … as in "Quad Core"?

As a matter of note the "3ud" seems to be mostly flagged in Swiss or German sites … health and or medications related …