might help if u wanna convert it to maya!!
ok so what u do is you download mmd and open it up and it will have on the left side where it should say "model manipulation" and click load
and then u select the PMX or PMD file to open and thats basically it!! i hope this might of answered your question and i hope i didnt misunderstand anything!!!
if you have any more questions feel free to ask me :^D