What uses could the Ple edition of Vue be in conjunction with Vue 6 studio pro?
import/export saving ecosystems? Things like that? Thanks just wondering.

PLE has a proprietary format that only the PLE version can read. And the other Vue versions not.

The Infinite PLE will Export Trees, rocks and other things as objects that you CAN use in Pro Studio,  Just ask the Renderosity Bryce Mod. Bobby Starr, he exports trees for use in Terragen2 all the time. But as far as native Vue Files like scene and VOB I don't think it works, because as Wabe has stated only the PLE can read them, but you can always export them in as obj or another format and then import them into Pro Studio ;^D

Maybe it should be said explicitely - ecosystems can not be exported to be used as ecosystems in other Vue versions. Nor veg-Files (vegetation). As oj of course, but that is not the same.

what if you applied an ecosystem to an object and exported the object?

(curiosity killin me now LOL)

It's the fact that Vue Native files when exported from the PLE have their own encoding and in that will not allow it to work in Regular (Non-PLE) Vue. But, you can Replicate, lets say 50 trees from one tree with variation and then export each individual tree as 3DS or OBJ or whatever.