Backup file created by various programs, including CorelDRAW, Ability Office Write, and PrintMaster Gold; contains a backup of the a currently opened document or project; used to recover program data in the event of a computer crash or file corruption.
NOTE: ABK files typically are not meant to be opened directly. Typically, the program that created them will guide users in the process of recovering any lost data.
File used by Arena, a freeware graphical user interface used by chess engines; contains "opening book" moves, which store opening strategies for an artificial intelligence player; may contain millions of predefined moves.
ABK files are used to reduce the computational expense of determining optimal strategies for the first several moves of a chess game.