(2021-06-01, 18:08)yevillustd Wrote: So LDR files are meant for single models and mpd are for models with submodels. Both are structured the same way and to convert one to/from ldr and mpd, all is needed is to rename the file extension?
That is exactly the opposite of everything that has been stated in this thread. I will repeat my personal opinion: All LDraw models should use the LDR extension.
Even if somebody doesn't agree with me on that, the fact remains that it is OK to use the LDR extension for any LDraw model. (In other words, it is definitely not valid to claim that the LDR extension should not be used for "mpd" files.)