DEC File Extension

The DEC file extension was created by Developer and is also known as the Declaration File. DEC is classified as a Developer Files and The format of this file type has not been determined yet. You can open DEC files in Microsoft Notepad program.

Declaration File Type

Declaration File Type
Extension .dec
Developer Not Available
Popularity 5.0 (22 Votes)
Mime Type mime-type/not.available
Default Program Microsoft Notepad
Category Developer Files
Format Not Available
Updated 6/1/2025

What is a DEC File Type?

They are usually saved in EDK II Declaration (DEC) format. EDK II is a development code base used to create D'drivers; Unified extensible firmware interface (UEFI), firmware images and applications. The purpose of the DEC format is to help build EDK components and EDK II modules and to create UEFI applications and firmware images.

Free Online DEC Tools & Apps

Access powerful and secure free online DEC tools to convert, view, edit, merge, split, and compare DEC files — all without installing any software. Our tools support the .DEC (Declaration File) file extension and run smoothly in any modern browser.

Select a tool below to explore features and manage your DEC files directly from your device with ease.

DEC Files Common Issues

There are few common issues with the Declaration File .DEC File Extensions while opening the .DEC files on Windows and MacOs, we have solution to those issues such as:

Can't Open DEC Files?

  1. You must have supported software programs installed for Declaration File on your system such as Microsoft Notepad.
  2. Associate default Microsoft Microsoft Notepad program for *.dec (Declaration File) files.


All Platform Software Programs for DEC File Extension

List of all softwares that can open the DEC files on each platforms such as Windows, Mac, iOS, Linux, Web and Android, you may click the each software link for more details for other supported formats for each software and the verified direct download links for each software with complete lisensing details.

Microsoft Windows logo image Open DEC File on Windows

Software License Developer
Microsoft Notepad image. Microsoft Notepad 1903 for Windows Bundled Microsoft
Notepad++ image. Notepad++ 6 for Windows Freeware Notepad Plus Plus

MacOs logo image - FileProInfo.comOpen DEC File on Mac OS

Software License Developer

Linux logo image - FileProInfo.comOpen DEC file on Linux

Software License Developer

Website logo image - FileProInfo.comOpen DEC file on Web

Software License Developer

iOS logo image - FileProInfo.comOpen DEC file on iOS

Software License Developer

Android logo image - FileProInfo.comOpen DEC file on Android

Software License Developer

About Licensing

  1. Free Trial This software are often used for an attempt period, like 14 days, before requiring payment. Some trial versions have a reduced feature set.
  2. Free This software is liberal to use. Examples include open-source , freeware software, like free programs supported by advertising.
  3. Free+ This software is liberal to download and use, but contains in-app purchases (IAP) to unlock additional content or functionality.
  4. Paid This software must be purchased so as to use it. it's going to be offered as a perpetual license or ongoing subscription.
  5. Included with OS This software is bundled with an OS , like Windows, macOS, or Android.

DEC file extension icon image.About DEC - Declaration File

FileProInfo is to help you understand about the Declaration File with *.DEC suffix, and provide the complete detail as how to open, edit, convert, merge, split and compare it with other related software programs, software download links and free online apps and tools.

Our professional team members at FileProInfo have been individually researched and verified the details for DEC. We want to be 100% accurate and publish the information about file formats, tools, apps and software programs that we have tested and validated.

If you would like to suggest any additions or updates to this page for DEC, please let us know.

Updated 6/1/2025