File Extension RMS File Format Rise of Nations random file RMS stands for Rise of Nations random file. 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 Can Rights Management Services, moderation, and MailTips be used together? Can you give more information about AD RMS exchange, outlook and office? Facebook thumbnail icons: Ready for use!