Having problems opening a DEF file?

We have programs that can open or convert your DEF files.

Opening DEF files

Did your computer fail to open a DEF file? We explain what DEF files are and recommend software that we know can open or convert your DEF 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.

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About File Extension DEF

File.org aims to be the go-to resource for file type- and related software information. We spend countless hours researching various file formats and software that can open, convert, create or otherwise work with those files.

If you have additional information about the DEF file format or software that uses files with the DEF suffix, please do get in touch - we would love hearing from you.