DEF File Type
- The quick factsWhat are DEF files and how to open them
Are you having problems opening a DEF file or just wondering what they contain? We explain what these files are used for and show you software that we know can open or otherwise handle your files.
What is a DEF file?
Files that contain the .def file extension are most commonly associated with Microsoft Visual C++ definition files. These files list the exports and attributes of a specific program that is linked by an application linker.
The DEF file format is commonly used when creating a dynamic link library during the development of a software application.
The 3D Fassade Plus software application also uses the .def file extension. These DEF files contain definition module files that are used by the software.
A variety of Nova Logic software games also use files with the .def file suffix. These DEF files contain game weapon files that are referenced by the software during a user's gameplay.
How to open DEF files
Important: Different programs may use files with the DEF file extension for different purposes, so unless you are sure which format your DEF file is, you may need to try a few different programs.
While we have not verified the apps ourselves yet, our users have suggested 10 different DEF openers which you will find listed below.
Last updated: April 4, 2022
Suggest another file format using extension DEF
While we know of one file format using the .DEF file extension, there may be more. It is widespread that different programs use files with the same file extension for very different types of data. Please let us know if you are aware of a different kind of .DEF file.
Various apps that use files with this extension
These apps are known to open certain types of DEF files. Remember, different programs may use DEF files for different purposes, so you may need to try out a few of them to be able to open your specific file.
![]() | Army Builder | User submitted |
![]() | progeCAD Professional | User submitted |
![]() | Movie Magic Screenwriter | User submitted |
![]() | WinEdt | User submitted |
![]() | MapBasic | User submitted |
![]() | Timetable | User submitted |
![]() | Open Watcom | User submitted |
![]() | Evaluation Flash | User submitted |
![]() | IrfanView | User submitted |
![]() | SingularLogic Report Viewer | User submitted |
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