File Extension RZK File Format File Crypt password file - All text editors RZK stands for File Crypt password file - All text editors. 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 compare Flat files using sort Auditing file changes What is CRDOWNLOAD file and how to open?