How to open .def file format?

The probably reason why you are at this website is a problem with opening .def file. The full name of the file is IOBit Malware Fighter Definitions File. If the double-click on the file’s icon shows you a message that additional programs are needed to open the file, you’ll find the list of helpful programs in the bottom of the page.The developer of this format is IObit.

.def file extension (IOBit Malware Fighter Definitions File)

Category	Developer/Producer	File description	Popularity
Data Files	IObit	IOBit Malware Fighter Definitions File

How to open .def file format?

.def file extension (IOBit Malware Fighter Definitions File)

Programs using this file extension: .def