What is the file format in Aoe3 DE? How much has the game engine changed? How moddable is it? Are the 3d models still .gr2 files, are the textures still stored in .ddt files, are there .xmb for storing data, whether the archives still .bar files? Can we mix gr2 animations and model bones/skeletons? and if there is some changes, then what are they? Is there official modding tools to access those files?
Its still the old file system. Only UI changed to XAML
Its still .xml.xmb for Techtreey, Protoy and Stringtabley