What is a 4DD file? 4DD files are mostly associated with the 4th Dimension by the 4D, Inc. This 4th Dimension item range includes various Windows and Mac OS technologies that may be utilized as standalone elements or as part of a completely functional, Browser, bridge database creation solution. The database fork is as follows: The capacity fork is known as 4DR. It contains the real data that a 4D database architecture file refers to, and it can be compressed using the Compress file instructi...