In computer programming, a dumper is a program which copies data from one source (usually a proprietary format) to another (usually in a more easily accessible format). A dumper is a program that saves data from the computer's memory, usually from a foreign process (program) to a (*.dmp) file. Often the process's memory is dumped automatically to disk if the program crashes. So you may recover any unsaved data from this file or send it to the developer so he can investigate what caused the crash.