Home : File Types : DEF File

.DEF File Extension

File Type 1Module-Definition File

4.0 (31 Votes)
CategoryDeveloper Files

What is a DEF file?

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

More Information

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

Open over 300 file formats with File Viewer Plus.
Programs that open DEF files
Updated 2006

File Type 2M.U.G.E.N. Character Definition File

4.0 (29 Votes)
CategoryGame Files

.DEF File Association 2

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.

Programs that open DEF files
Updated 12/6/2011

File Type 3SmartWare II Data File

3.9 (13 Votes)
CategorySpreadsheet Files

.DEF File Association 3

Spreadsheet and database format used by SmartWare II database software.

Programs that open DEF files
Updated 2006

File Type 4IOBit Malware Fighter Definitions File

3.6 (8 Votes)
CategoryData Files

.DEF File Association 4

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.

More Information

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.

Programs that open DEF files
Updated 10/1/2012

About DEF Files

Our goal is to help you understand what a file with a *.def suffix is and how to open it.

All file types, file format descriptions, and software programs listed on this page have been individually researched and verified by the FileInfo team. We strive for 100% accuracy and only publish information about file formats that we have tested and validated.

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