Basic information about DEF file

When there is a problem with opening files with the file extension DEF（*.DEF or *.def）, you do not need a computer expert. In most cases, using the helpful suggestions of experts contained in our website as well as appropriate programs, you can solve the problem with the DEF file yourself.

There are 9 file types using the DEF file extension in our database. In the further part of this page, you will find detail information about all the DEF file with their brief description and a list of programs that support DEF file sorted by operating systems. The table below provides useful information about the DEF file extension. It answers questions such as:
  • What is the DEF file?
  • How to open a DEF file?
  • What programs do I need to open a DEF file?
  • What programs help to create and edit a DEF file?
  • How to convert DEF files to another file format?
  • How to convert another files to DEF file format?


1.Detail information about DEF file extension: SmartWare II Data File

File type SmartWare II Data File Category Spreadsheet Files
Developer SmartWare File format N/A
Description DEF file is a SmartWare II Data File developed by SmartWare. Spreadsheet and database format used by SmartWare II database software.
Software programs that will open, edit or convert DEF files

Windows		 SmartWare


2.Detail information about DEF file extension: Module-Definition File

File type Module-Definition File Category Developer Files
Developer N/A File format N/A
Description DEF file is a Module-Definition File.
Software programs that will open, edit or convert DEF files

Windows		 Microsoft Visual Studio 2017
AniSprite
ArcGIS for Desktop Basic (ArcView)
AutoCAD
SmartWare
SmartWare II
Visual C++

Linux		 DataFlex


3.Detail information about DEF file extension: M.U.G.E.N. Character Definition File

File type M.U.G.E.N. Character Definition File Category Game Files
Developer Elecbyte File format Text
Description DEF file is a M.U.G.E.N. Character Definition File developed by Elecbyte.
Software programs that will open, edit or convert DEF files

Windows		 Elecbyte M.U.G.E.N.


4.Detail information about DEF file extension: IOBit Malware Fighter Definitions File

File type IOBit Malware Fighter Definitions File Category Data Files
Developer IObit File format Binary
Description DEF file is a IOBit Malware Fighter Definitions File developed by IObit.
Software programs that will open, edit or convert DEF files

Windows		 IObit Malware Fighter


5.Detail information about DEF file extension: Definition Data

File type Definition Data Category Misc Files
Developer N/A File format N/A
Description DEF file is a Definition Data.
Software programs that will open, edit or convert DEF files

Windows		 RAD Studio
Visual C++
RAD Studio
ZEBU's Directory Printer
ArcGIS for Desktop Basic (ArcView)
AniSprite
AutoCAD
SmartWare II
SmartWare

Linux		 DataFlex


6.Detail information about DEF file extension: Data Entry/Review Module File

File type Data Entry/Review Module File Category Misc Files
Developer N/A File format N/A
Description DEF file is a Data Entry/Review Module File.
Software programs that will open, edit or convert DEF files

Windows		 Data Entry & Review Module


7.Detail information about DEF file extension: Nova Logic Game Weapon Profile File

File type Nova Logic Game Weapon Profile File Category Game Files
Developer N/A File format N/A
Description DEF file is a Nova Logic Game Weapon Profile File.
Software programs that will open, edit or convert DEF files

Windows		 Delta Force


8.Detail information about DEF file extension: ESwin Wizard File

File type ESwin Wizard File Category Settings Files
Developer N/A File format N/A
Description DEF file is a ESwin Wizard File.
Software programs that will open, edit or convert DEF files

Windows		 ESwin


9.Detail information about DEF file extension: Id Tech 6 Video Settings

File type Id Tech 6 Video Settings Category Game Files
Developer N/A File format N/A
Description DEF file is a Id Tech 6 Video Settings.
Software programs that will open, edit or convert DEF files



Can't open a DEF file?

When you click a file to open it, operating system examines the filename extension. If operating system recognizes the filename extension, it opens the file in the program that is associated with that filename extension. When operating system does not recognize a filename extension, you receive the following message:

”Can't open this file: example.DEF”。

To open this file, you install one of the applications from the list of software programs that you found here, you should be able to open, edit or convert the file with the DEF extension without any issue.


Where I can download the application that support DEF file?

If you do not know where you can download the application from our list, click on the link (which is the name of the program), you will find more information there on the location where to download the required application. Most often they are the websites of software manufacturers.


How to change file associations?

  • Right-click a file with the extension whose association you want to change, and then click "Open With".
  • In the "Open With" dialog box, click the program whith which you want the file to open, or click "Browse" to locate the program that you want.
  • Select the ”Always use the selected program to open this kind of file” check box.


Can I change the extension of DEF files?

Changing the filename extension of a file is not a good idea. When you change a file's extension, you change the way programs on your computer read/open the file. The problem is, changing the file extension does not change the file format. Select a software program from our list and install it on your computer. If the file has not opened correctly, you have to look for a different software program from our list. Sometimes you have to repeat the operation several times.


What else may cause problems width open a DEF file?

The reasons for the lack of the ability to open a DEF file on your computer may be at least several. The easiest thing is to find a suitable application installed on your computer, which will open a DEF file. If there is still something wrong, you might want to check:

  • Whether the DEF file is damaged.
  • Whether the DEF file is incorrectly linked in the registry entries.
  • Whether the DEF file extension has been accidentally removed from the Windows registry.
  • Whether the installation of an application that supports the DEF file format is incompletely.
  • Whether the DEF file is infected.
  • Whether the drivers of the equipment used for opening a DEF file are up to date.
  • Whether your computer has enough hardware resources to open a DEF file.

If the DEF file still not working with your software after eliminating the above shortcomings? That means that the problem is more complex and requires the help of a specialist.