(2021-12-10, 21:06)Franklin W. Cain Wrote: So, what happened? Why can LDView "see" these files, but LDCAD can not?
You probably only need to register the unofficial parts location.
http://www.melkert.net/LDCad/faq#faq_unoflib
LDView does see those because they are probably inside the 'unoffical' submap (besides the parts and p ones).
LDCad doesn't support that (yet), because it instead supports multiple libraries.
So it is easiest to use the ldrawunf.zip file as is as described in the above link, direct link to the zip:
https://www.ldraw.org/library/unofficial/ldrawunf.zip