File Extension RD3 File Format Ray Dream Designer Graphics RD3 stands for Ray Dream Designer Graphics. This was last updated in March 2012 By Margaret Rouse Browse File Extensions Alphabetically: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z # Ask a Question. Find an Answer. Ask your peers a question about this file extension. Ask a Question System Checker What is the difference between NVIDIA Graphics and Integrated Graphics? Which type of tool we need to build web design and graphics design?