MPD vs LDR files

[Orion Pobursky]

What is the difference between MPD and LDR files? It will seem all the files from the LDraw Official Model Repository are MPD files.

And is there a way to convert MPD files to LDR files? It is possible to convert a LDR to a MPD file in LeoCAD but not the other way around.

The is no functional difference. Typically, MPDs are files that have one or more LDR file defined within them. All LDraw compliant software should be able to load and manipulate both.