.DEK File Extension

Magic: The Gathering Deck File

Developer Wizards of the Coast
4.4  |  17 Votes

What is a DEK file?

A DEK file is a card deck file used by Magic: The Gathering Online (MTGO), an online collectible card game. DEK files contain a list of cards that usually comprise a playable Magic: The Gathering deck. In some cases, DEK files list a non-playable collection of cards, such as a subset of a player’s collection, rather than a playable deck.

More Information

Screenshot of a .dek file in GitHub Atom
DEK file open in GitHub Atom

In addition to using DEK files with MTGO, many Magic players use DEK files to import decks to or export decks from collection-tracking and deck-building applications and websites, such as:

  • MTG Studio
  • CardHoarder

How to open a DEK file

Since DEK files are saved in the XML format, you can open, view, and edit them with any text editor, such as Microsoft Notepad (Windows), Apple TextEdit (Mac), or GitHub Atom.

If you’d like to import a DEK file into MTGO, you should:

  1. Log in to MTGO and select the Collection tab.
  2. Select the Add Deck icon.
  3. When the Add or Import Deck(s) menu appears, select Import.
  4. Navigate to the folder containing your DEK file, select it, and then select Open.
  5. In the Add or Import Deck(s) menu, specify your deck’s name and format. Then, click OK.
After you click OK, your deck will appear in the Collection tab.

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Programs that open or reference DEK files

Yugioh Virtual Desktop Deck File

Developer XeroCreative
4.3  |  4 Votes

A DEK file may also be a file used by Yugioh Virtual Desktop (YVD), a game used for playing Yu-Gi-Oh! card games online. It is saved in plain text and contains a list of cards in the deck separated by line breaks. DEK files are used for saving decks for different styles of gameplay.

Programs that open or reference DEK files

LackeyCCG Card Deck File

Developer LackeyCCG
3.7  |  3 Votes

A DEK file may also be a file created by LackeyCCG, a tool used to create card decks and play collectible card games (CCGs) online or offline. It stores a card pool, which is made up of player cards. DEK files are used for saving decks for different games as well as for different playing styles.

More Information

LackeyCCG has been used to create decks for various games such as Magic: The Gathering, Pokémon TCG, Yu-Gi-Oh!, and many others.

Programs that open or reference DEK files


Eavesdropper Batch File

Developer Eavesdropper
3.7  |  3 Votes

A DEK file may also be a Batch Processing Command file that contains a list of commands for Eavesdropper, a seismic data processing program. It includes a list of instructions that are used to process seismic data (.DAT) files.

More Information

A sample DEK file command is: DSEIS EDKL.dek EDKL.lst

This command runs the instructions in the DEK file through the DSEIS program and outputs the results to a journal file called "EDKL.lst."

Programs that open DEK files


Memorize-It Flashcard Deck

Developer Side-Eight Software
2.0  |  2 Votes

A DEK file may also be a deck of flashcards that may include text, sound, and images. It is used by Memorize-It for creating and administering quizzes that can be used for studying and testing knowledge. DEK files are available for hundreds of different topics.

Programs that open DEK files


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