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DEF file format description

DEF file format

We made this page to help you understand how to work with DEF files. Here, you can find info on software that can handle these files. It includes simple programs for opening and converting them.

Learn about the DEF file and its functions here!

We also explain how to convert them into other types. It's simple and hassle-free. For opening or changing DEF files, this page offers all the tools you need.

#1 C++ Definition File

The DEF file is categorized under Development. It is associated with Visual C++, serving as a C++ Definition File. C++ is a general-purpose programming language. It is a statically-typed free-form multi-paradigm language supporting procedural programming, data abstraction, object-oriented programming, and generic programming. Visit the website of Visual C++ for a detailed description of the DEF format.

Application:Visual C++
Category:Development files
Mime-type:text/plain
Magic:- / -
Aliases:-

C++ Definition File related extensions

  • lbr Micro Focus COBOL Data
  • link Eclipse Link File
  • ohl Delphi OpenHelp Links
  • 2lang 2LANG Data

#2 IOBit Malware Fighter Definitions Data

The DEF file is categorized under Data. It is associated with IOBit Malware Fighter, serving as an IOBit Malware Fighter Definitions Data. IObit Malware Fighter is an anti-malware and anti-virus program. Visit the website of IOBit Malware Fighter for a detailed description of the DEF format.

Application:IOBit Malware Fighter
Category:Data files
Mime-type:application/octet-stream
Magic:- / -
Aliases:-

IOBit Malware Fighter Definitions Data related extensions

  • gba Nintendo GameBoy Advance ROM Image
  • aa4 Clone Manager Assembly Results Data
  • bch PCCharge Offline Transaction Log
  • hyv CARE-S InfoWorks Velocity Hydrograph Data

#3 Delta Force Weapon Profile Data

The DEF file is categorized under Game Data. It is associated with Delta Force, serving as a Delta Force Weapon Profile Data. Delta Force is a tactical first-person shooter computer game by developer and publisher NovaLogic. Visit the website of Delta Force for a detailed description of the DEF format.

Application:Delta Force
Category:Game Data files
Mime-type:application/octet-stream
Magic:- / -
Aliases:-

Delta Force Weapon Profile Data related extensions

  • wf FIFA 2000 Game Data
  • lv6 Return to Wonderland Game Level Data
  • vis Microsoft Flight Simulator Visibility Data
  • ekv Left 4 Dead Game Data

#4 Mugen Character Definitions Data

The DEF file is categorized under Game Data. It is associated with Mugen, serving as a Mugen Character Definitions Data. Mugen is a freeware 2D fighting game engine designed by Elecbyte. Visit the website of Mugen for a detailed description of the DEF format.

Application:Mugen
Category:Game Data files
Mime-type:application/octet-stream
Magic:- / -
Aliases:-

Mugen Character Definitions Data related extensions

  • air Mugen Animation Data
  • cmd Mugen Character Commands Data
  • cns Mugen Character States Data
  • sff Mugen Sprite Data

#5 ESwin Wizard

The DEF file is categorized under Data. It is associated with ESwin, serving as an ESwin Wizard. ESwin is a generic 3D structural design application developed by Procedimientos. Visit the website of ESwin for a detailed description of the DEF format.

Application:ESwin
Category:Data files
Mime-type:application/octet-stream
Magic:- / -
Aliases:ast

ESwin Wizard related extensions

  • es ESwin Project

#6 Doom 3 Map Definition Data

The DEF file is categorized under Game Data. It is associated with Doom 3, serving as a Doom 3 Map Definition Data. Doom 3 is a science fiction survival horror first-person shooter video game developed by id Software. Visit the website of Doom 3 for a detailed description of the DEF format.

Application:Doom 3
Category:Game Data files
Mime-type:application/octet-stream
Magic:- / -
Aliases:-

Doom 3 Map Definition Data related extensions

  • drs Age of Empires 2 Game Data
  • ftl Faster Than Light Mod Data
  • resdex Stronghold 3 Resource Data
  • ttg Red Alert 3 Game Data

#7 Binary Editor Definition Data

The DEF file is categorized under Configuration. It is associated with Binary Editor, serving as a Binary Editor Definition Data. The Binary Editor software allows for editing of the Ford EEC binary data. Its definition files (Strategy Files) are open source and are saved in Excel. Visit the website of Binary Editor for a detailed description of the DEF format.

Application:Binary Editor
Category:Configuration files
Mime-type:application/octet-stream
Magic:- / -
Aliases:-

Binary Editor Definition Data related extensions

  • fcfg Fedora Server Configuration Data
  • hgrc Mercurial Configuration Data
  • ehil Evozi HTTP Injector Lite Data
  • sll SpectraLayers Pro Layout Settings

#8 SmartWare Definition Data

The DEF file is categorized under Data. It is associated with SmartWare, serving as a SmartWare Definition Data. SmartWare is a programming platform. SmartWare also includes a word processor, spreadsheet, and communication modules. Visit the website of SmartWare for a detailed description of the DEF format.

Application:SmartWare
Category:Data files
Mime-type:application/octet-stream
Magic:- / -
Aliases:-

SmartWare Definition Data related extensions

  • aif SmartWare Executable Program
  • bdc SmartWare Word Processor Backup Data
  • bdf SmartWare Backup Definition Data
  • bfq SmartWare Backup Query Definition

Did someone accidentally misspell the DEF filename?

The DEF filename extension may be misspelled. We compiled a list of similar file extensions to help you find errors.

Filename extensions similar to DEF:

Windows can't open your DEF file?

When you try to open a file by double-clicking it, Windows looks at the file's name to figure out what to do. If Windows doesn't know the file type, it'll ask you to choose an app to open this DEF file.

To set the DEF file association in Windows 11, you can follow these steps

  1. Open the Settings app by clicking on the Start menu and selecting the gear icon.
  2. In the Settings app, click on System and then select Apps from the left-hand side menu.
  3. Scroll down and click on the Default apps option.
  4. In the Default apps section, you will find various categories. They include Email, Web browser, and Music player.
  5. Locate the category that matches the file type you want to associate. For example, choose Photos for image files, or Video player for video files.
  6. Click on the current default app listed under the category. A list of available apps will appear.
  7. Choose the app you want to set as the default for that file type. If the app you want is not listed, click on More apps to see more options. Or, click on Look for an app in the Microsoft Store to search for apps.
  8. After selecting the app, it will become the default choice for opening files of that type.

It's worth mentioning that you don't always need to set DEF file association. Many apps can open files. They don't need a specific file association to be set.

Handle DEF files with care

Exercise caution when handling DEF files from unknown sources. Files from certain sources can threaten your computer's security. They might contain malware, viruses, or harmful software. To minimize risks, avoid downloading or opening unfamiliar DEF files. Use trusted antivirus software to scan files from unknown sources before opening.

If you find the information on this DEF page useful, please feel free to link to this page.

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