File Extension Database

Open DEC File

DEC files have two main uses, different from each other, namely:

ADL Programs

A DEC extension file is used by ADL (Application Development Language) programs to store text-based statements and has the ability to contain global variables and constants that can be referenced by other files within a programming project.

In this application, DEC files are in the EDK Declaration II format, which is a development code base used to create drivers, firmware images, and Unified Extensible Firmware Interface applications.

Magic: The Gathering Online Deck, Game

A DEC file is used by Magic: The Gathering Online (MTGO) to contain a deck of cards in its online game.

Being a database, DEC files store a collection of cards that are part of a playable deck, including the total number of cards and the identification of each card in the deck.

To open and deal with a DEC file, you must have one of the following programs installed, previously check the type of file format

Open DEC File on Windows

Find a DEC file in question in Windows OS File Explorer and double click on it to launch the corresponding application.
If a DEC file is not opened in an application and you instead get a "Windows can't open a file" error message you should try looking for an application which can open the file in question.
If you know the application which can open DEC file then run it and see if there is a File->Open main menu option in the application.
If you don't know the application which function as DEC file opener then try to search for "DEC wiki", "application to open DEC file" or "open DEC file" queries in the search engine you like.
Install the application you found and check if it can open DEC file

Open DEC File on Mac OS

Find a DEC file in question in Mac OS Finder and double click on it to launch the corresponding application.
If a DEC file is not opened in a Mac OS application and you instead get a "There is no application set to open the file" error message you can click on "Search App Store" in the error dialog and Mac OS will show you applications compatible with DEC file.
If you know the Mac OS application which can work as DEC file opener you can choose the "Choose Application..." option in the error box to associate the file extension and open DEC file in it.
If you don't know the application which can open DEC file then try to search for "DEC wiki", "application to open DEC file" or "open DEC file" queries in the search engine you like.
Install the application you found and check if it can open DEC file

Open DEC File on Android

If you downloaded a DEC file on Android device you can open it by following steps below:

In the Android apps list on your Android device find "My Files" or "File manager" app and tap to start it.
Tap on "Downloads" folder inside the app.
You should see your downloaded DEC file in that folder.
Tap on the file. If Android device supports opening the file you downloaded it will open in the corresponding app.
If file does not open you can look for the corresponding app that can open the file by searching Android App Store for the "DEC".
If you cannot open the file with the apps from Android App Store it is possible that the file could only be opened on desktop platforms such as Windows or Mac OS. Try searching the internet for "DEC file" and see if any desktop applications can open it.
It is also possible that the file you downloaded is outdated and is no longer supported.

Open DEC File on iPhone or iPad

To open DEC File on iOS device follow steps below:

Open Files app on your iPhone or iPad device. You can find it by swiping down on the home screen and typing "Files" in the search bar.
Tap on the Downloads folder on the Files app home screen.
You will see all files that you recently downloaded. Tap on the DEC file to view it.
If you have the right app that can open it it will automatically launch and open your file.
If you don't have the app which can open it you need to serch Apple app store for "DEC". This way you can find apps which can open DEC files.
If this doesn't help it is possible that your file could be opened only by the desktop application. To find an app which can open it on desktop look for "DEC file" in your favorite search engine.

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