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.

Software that will open, convert or fix DEF files

Try a universal file viewer

Try a universal file viewer like Free File Viewer. It can open over 200 different types of files - and most likely yours too. Download Free File Viewer here.

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.

How-to guides
Reviews
Popular
mark
What is a file extension?
A file extension is the characters after the last dot in a file name. For example, in the file name "winmail.dat", the file extension is "dat". It helps Windows select the right program to open the file.
mark
We help you open your file
We have a huge database of file extensions (file types) with detailed descriptions. We hand pick programs that we know can open or otherwise handle each specific type of file.
mark
Original downloads only
All software that we list on the file.org website is hosted and delivered directly by the manufacturers. We do not host the downloads, but point you to the newest, original downloads.