Retire MPD

[Orion Pobursky]

Are there any known programs that would load a file incorrectly if it's extension was ldr but was, in fact, a mpd? If not, I move to retire the mpd file extension and have all non-part files be .ldr

In light of this thread:
https://forums.ldraw.org/thread-24589-po...l#pid41128

I'd like to renew my call to retire the MPD extension and to go LDR only for model files. All software that claims to be LDraw compliant should implement the MPD spec and there is functionally not difference between the two. Since it clear that at least some users are confused, I'd like to simplify things.