Just a few questions about MDL7.

I have the A6 trial version while I try to figure out how to recover my keyfile (i've already emailed support) and while bringing in some models from gameSpace, I was saving them as MDL7.

They would not show up when I ran the level.

When I save them as MDL5, they show up just fine

These models are unskinned and they were made in gameSpace, saved as a .x, and then imported into MED.

My question is, is MDL7 for A7? Is it not supported in the Trial version? And is it better than MDL5 and if so how?