File Extension ROCKWELL-4 File Format Rockwell 4-bit ADPCM data ROCKWELL-4 stands for Rockwell 4-bit ADPCM data. 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 Manufacturing IoT takes the lead on connecting devices VM disk size is larger than specifed size and cannot clone. Five IoT battlegrounds: Where does your company fit?