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Informations about the DEF filename extension and the file formats associated with it

We collected the information you should know about the .def filename on this page. If you were sent a(n) .def file in an e-mail, but you don’t know what to do with it, then you can find help here. We strive to suggest free, open-source applications that are available to everyone for the file formats.

2 filename extension(s) are in our database

.def - C++ Definition File

The DEF file is a Development file, which is connected to the C++ Definition File according to our registry. With the adequate settings, the C++ Definition File (.def) files can be opened or converted with the help of Visual C++++.

Format description:
DEF format
Visual C++
Magic string:
- / -
Related links:
Related extensions:
Visual C# .NET Class
Visual C++ Dialog
C++ Header File
Visual C++ TLH Header
Visual C++ TLI Header

.def - Binary Editor Definition Data

The DEF file is a Configuration file, which is connected to the Binary Editor Definition Data according to our registry. With the adequate settings, the Binary Editor Definition Data (.def) files can be opened or converted with the help of Binary Editor.

Format description:
DEF format description not yet available
Binary Editor
Magic string:
- / -
Related links:
Related extensions:
PC Desktop Cleaner Configuration
Rhino 3D Color Options
VICE Keyboard Map
ShopSite Store Authorization Data
TeamSpeak Keybinding
DragThing Color Settings

Important! Programs other than the ones listed above may also use the .def file extension. Even harmful programs can create files with the .def extension to store data in them. Always be careful with .def files coming from unknown sources. Don’t open executable files that arrived in mails, even if you know the sender.

The .def file can’t be opened on your computer?

If the program necessary for opening the .def file is installed properly on your computer, then the quickest and simplest way to open the .def file is to double-click on the file’s name. If that doesn’t work, then the right software probably isn’t installed on your computer.

While opening the .def file, you may receive an error message from the associated application, this can be caused by the following:

Incorrectly given .def extension

The .def filename extension can be given incorrectly sometimes. The cause of the error could be a mistake or a simple typo. We found the following incorrectly given filename extensions that are the most frequent in the case of .def files.

edf, cef, dsf, dff, df, det, wef, dee, sef, dec, fef, de, eef, d3f, dwf

Maybe you’re not even looking for the .def file extension?

It’s possible the the file’s extension was given incorrectly. Below, we list some filename extensions that are similar to the .def extension. It’s possible that the one you’re looking for is among them.

CenturionMail Encrypted Email
Autodesk 3D Scene
WinAce Encrypted Archive
DEViANCE Group Abbreviation
Diploma Exam File
VersaPro Declaration File

Associated applications

The Windows operating system stores information about the applications associated to the file extensions in the registry database. The associations can be queried or modified in the Command Prompt window with the "assoc" command.

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We gladly accept application suggestions, but our primary goal is to suggest reliable, open-source applications that can be freely distributed to the users.

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