File Extension RCS File Format RCSWin job file RCS stands for RCSWin job 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 Fedora 9 boot failure Unable to execute "/bin/sh" When will a job go to MSGW? Outfile for WRKJOB command.