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4 File Associations

.DEF File Extension

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File TypeModule-Definition File
DeveloperN/A
Popularity
4.5 (4 Votes) Thanks for voting!
Rare Uncommon Average Common Very Common
CategoryDeveloper Files
File Format Description

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.

Program(s) that open .DEF files
Updated 2006

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File Type
This file is saved in a plain text format.
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M.U.G.E.N. Character Definition File
DeveloperElecbyte
Popularity
2.0 (2 Votes) Thanks for voting!
Rare Uncommon Average Common Very Common
CategoryGame Files
File Format Description

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.

Program(s) that open .DEF files
Updated 12/6/2011

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File TypeSmartWare II Data File
DeveloperSmartWare
Popularity
2.0 (1 Vote) Thanks for voting!
Rare Uncommon Average Common Very Common
CategorySpreadsheet Files
File Format Description

Spreadsheet and database format used by SmartWare II database software.

Program(s) that open .DEF files
Microsoft Windows Logo
Windows
Icon SmartWare
Updated 2006

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File TypeIOBit Malware Fighter Definitions File
DeveloperIObit
Popularity
1.0 (1 Vote) Thanks for voting!
Rare Uncommon Average Common Very Common
CategoryData Files
File Format Description

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.

Program(s) that open .DEF files
Updated 10/1/2012