Yes, I agree about advanced feature of Pro version, but I am talking about the most BASIC of a game engine that user must have, the game format. We must have a way to make content into game, and for all case, the Software Supplier should encourage user to do it, not limit them. There are thousand of thing that may make different between Pro and other version: dyn light, physic, terrain, but the file format should be support the same. It should not be some kind of advanced feature.