File Extension QDI File Format Dictionary QDI stands for Dictionary. 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 Get full data dictionary of DSPUSRPRF OUTFILE data dictionary for SAP customer and product master Share MS-Word spelling dictionary with other LAN computers?