katana4dDatafile Katana4D stores all your data (e.g. Katana settings, projects, programs, etc.) in one file. This file is called 'Datafile' and has the file extension .4DD (4thRged katana 3D models for download, files in 3ds, max, c4d, maya, blend, obj, x with free format conversions, royalty-free license, and extended usage rhts.