File Extension SCG File Format Septerra Core Saved Game SCG stands for Septerra Core Saved Game. 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 Game Specifications Cost of virtualization and diminishing rate of returns Should I go with i3 or i5 processors for my new PC?