DEF files: what are they and how do I open them?
Are you facing difficulties opening unknown files on your computer, or wondering exactly what this file is?
We've got the information and best software solutions for opening these files effortlessly.
.def file type #1: Definition data
Files with def extension are usually encountered as definition files used SmartWare, Visual Studio and other apps.
Further details:
File extension def is commonly used for so called definition files. These file contains various settings that define certain characteristic ,or operation parameters for programs, devices or their part. Such files are used by many different programs. Sometimes also used for export purposes.
For example module-definition files provide the linker with information about exports, attributes, and other information about the program to be linked. The def file is most useful when building a DLL.
Open file with:
Microsoft Visual Studio
IDE for creating programs, or websites and web applications
Visual C++
IDE for C and C++ programming language
.def file type #2: Data Entry/Review Module file
Files with def extension are used by Data Entry & Review Module utility.
Further details:
The def file extension is associated with the Data Entry & Review Module application that helps users to automate the flow of data. The .def file contains various data used for internal purposes of the Data Entry/Review Module application.
Open file with:
Data Entry & Review Module
A data form management software platform
.def file type #3: id Tech 6 video settings
A def file extension is related to the id Tech 6 video gaming engine. A def file contains video card settings.
Further details:
The def file extension is associated with the id Tech 6 a video gaming engine, developed by id Software for Doom (Doom 4, Doom 2016) video game.
The def file contains video card (graphic card) settings. These files are included in *.resources game archive.
Open file with:
Doom (Doom 4)
Remake of legendary 3D action shooter video game
.def file type #4: IOBit Malware Fighter definitions
Files with def file extension are related to the IOBit Malware Fighter and used for its definition data.
Further details:
The def file extension is associated with the IOBit Malware Fighter, a software for Microsoft Windows operating system, which is able to detect and remove malware from PC.
The def file contains malware definitions for Malware Fighter.
Open file with:
IObit Malware Fighter
An advanced malware removal
.def file type #5: NovaLogic game weapon profile
A def file extension is related to video games developed by NovaLogic. A def file stores game data.
Further details:
The def file extension is also used in NovaLogic game engine (Voxel Space engine - Delta Force series, and other video games) for files that contain weapon profiles, item profiles, etc.
Open file with:
Delta Force
A tactical first-person shooter computer game