.MRC files are script files used exclusively by mIRC. mIRC is a popular Internet relay chat program, which utilizes the well known Internet Chat Relay (IRC) framework. .MRC files can typically be created using the mIRC Scripts Editor, a tool that is used for creating scripts that automate functions or tasks within the mIRC application. Commonly scripted functions include, but not limited to, creating dialog windows and protecting users and channels against spam and flooding.