Magic: The Gathering is collectable card game which was originally launched as a printed collectable card game. In order to save the player assets in this game a virtual version of this game is released. The user makes a deck of cards which is stored as a DEK file for the game.

This file contains information related to the number of cards in deck, name of the cards and number of times each card is placed in the deck. This file is only used to refer the cards that are added in the deck and does not contain any data associated to the cards themselves.