File Extension IGS File Format 2D or 3D CAD model IGS stands for 2D or 3D CAD model. 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 digital modeling and fabrication 3D TV without the goggles Review: Aiptek i2 3D camera - Great fun, very cheap!