Cdd extension is associated with Concept Draw Drawing/Diagram. You have chance to open cdd files with Concept Draw software.
Cdd extension stands for 2D draft drawings. These file formats are created by Concept Draw program. You may find Macintosh and Pc versions of Concept Draw software. You should install this software to being able to open cdd files on your computer. To get detailed information about the program, please check the following web page.
What to use cdd
which page related to cdd file
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