File Extension TT File Format ThinkTank file TT stands for ThinkTank 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 Access is denied to Remote Agent (veritas backup verion 10.00) Need SQL query I need to create and run this on the CMD and make a program.