Files with dek file extension are kindred with Magic: The Gathering Online, they store a collectable cards in xml format.
There is one other file type using
the DEK file extension!
.dek - Memorize-It flashcards deck
Detailed description
Software that open dek file
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What is dek file? How to open dek files?
The dek file extension is related to Magic: The Gathering Online, the online version of the world’s premier trading card game, Magic: The Gathering.
The dek file stores a collection of collectable cards in XML format.
The default software associated to open dek file:
Magic: The Gathering Online 
Company or developer:
Wizards of the Coast LCC
Magic Online is the online version of the world’s premier trading card game, Magic: The Gathering, where you can play against anyone, anywhere, any time!
Help how to open:
The dek files are used for internal purposes of Magic The Gathering Online.
How to convert:
As far as we know, this .dek file type can't be converted to any other file format. This is usually the case of system, configuration, temporary, or data files containing data exclusive to only one software and used for its own purposes. Also some proprietary or closed file formats cannot be converted to more common file types in order to protect the intellectual property of the developer, which is for example the case of some DRM-protected multimedia files.
List of software applications associated to the .dek file extension
Recommended software programs are sorted by OS platform (Windows, macOS, Linux, iOS, Android etc.)
and possible program actions that can be done with the file: like open dek file, edit dek file, convert dek file, view dek file, play dek file etc. (if exist software for corresponding action in File-Extensions.org's database).
Hint:
Click on the tab below to simply browse between the application actions, to quickly get a list of recommended software, which is able to perform the specified software action, such as opening, editing or converting dek files.
Software that open dek file - Magic The Gathering deck
Programs supporting the exension dek on the main platforms Windows, Mac, Linux or mobile. Click on the link to get more information about Magic: The Gathering Online for open dek file action.
Programs that can create dek file - Magic The Gathering deck
Programs supporting the exension dek on the main platforms Windows, Mac, Linux or mobile. Click on the link to get more information about Magic: The Gathering Online for create dek file action.
Unspecified and all other actions for computer programs working with dek file - Magic The Gathering deck
Click on the software link for more information about Magic: The Gathering Online. Magic: The Gathering Online uses dek file type for its internal purposes and/or also by different way than common edit or open file actions (eg. to install/execute/support an application itself, to store application or user data, configure program etc.).
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