File Extension Library

.DEF File Extension

  • Developer by: Elecbyte
  • Category: Game Files
  • Format: Text

What are .DEF files and how to open them?

Can't open .DEF file? Are you wondering what it contains? On our site we will explain to you what this file is, what it is used for and what software opens the .DEF file.

What is a .DEF file extension?

.DEF file extension is created by Elecbyte. .DEF has been classified as Game Files. The format of .DEF file is Text.

.DEF is M.U.G.E.N. Character Definition File

Game data file used by M.U.G.E.N., a sprite-based game engine used for making 2D fighting games; contains the definition for a character, including the character name and version information and the character specification files (.CNS, .SFF, .CMD, and .AIR) used by the engine.

List of all softwares that can open the M.U.G.E.N. Character Definition File
Elecbyte M.U.G.E.N.
File Type 2 Module-Definition File
Category: Developer Files

Lists the exports and attributes of a program to be linked by an application linker; used in software development when creating a DLL.

DEF files are used by Microsoft Visual C++, a component of Microsoft Visual Studio, as well as other C++ development software.

List of all softwares that can open the Module-Definition File
Microsoft Visual Studio 2017
File Type 3 SmartWare II Data File
Developer by: SmartWare Category: Spreadsheet Files

Spreadsheet and database format used by SmartWare II database software.

File Type 4 IOBit Malware Fighter Definitions File
Developer by: IObit Category: Data Files Format: Binary

File used by IObit Malware Fighter, a program used for removing malware and spyware from the PC; saves virus definitions used for identifying and removing malware from the computer.

DEF files use the filenames core000.def, core001.def, core002.def, etc. They are stored in the \db\ directory of the IObit Malware Fighter installation.

List of all softwares that can open the IOBit Malware Fighter Definitions File
IObit Malware Fighter

How to fix problems with .DEF files

  1. You need to update the application that you normally use to open .DEF files. Only the latest version of the software supports the current .DEF file format
  2. You need to check the .DEF file for viruses. To do this, you need to scan it with a popular antivirus (Norton, Nod32, Kaspersky, Dr.Web, etc.)