File Extension TPC File Format Topic Connection Placeholder TPC stands for Topic Connection Placeholder. 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 TPC Capabilities Cannot copy and paste images from Google Chrome into Word 2010 Windows Thin PC: True benefit or more of the same?