1.FBXFBX can hold more information thenthan you think, things like information about the modefiersmodifiers you use, however there are limits. i
I cant find a list about the user properties in blender wichBlender which are suportedsupported in fbxFBX but iI know there is one for 3ds Max:
saySay you wanted to export a file from 3ds Max to an FBX, this is all the information it can store apart from the usual meshes textures and animations.
i dont understand it fully myself but i hope this helpt a little