skeleton exporting problem

I created one box and one cylinder in 3dsmax,then binded them to one bones,when i exporting i got two '.skeleton' files and two '.mesh' files,my question is how did i got one '.skeleton' files with two mesh files?

Your project requieres those objects to be different objects? you can attach them to create a single object

I think this will be usefully sometimes,especially in mmorpg player can changing the physique and clothes without changing the entire mesh.