File Extension WPA File Format Word processor document (ACT!) WPA stands for Word processor document (ACT!). 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 Hope shines through crack in lid of open standards coffin Microsoft Word How can Word use the additional fields of a lookup column?