Settings file created by Mandelbrot Explorer, a program that allows users to view fractal images produced from Mandelbrot and Julia sets; contains the parameters for a fractal region, including the minimum and maximum X and Y coordinates and the image resolution. FRR files are used to store the settings for a particular magnification level within a fractal image. They are saved using XML formatting, and can be viewed with any text editor. NOTE: Mandelbrot Explorer 2.5 and earlier versions save fractal region settings files with the ".frr" extension. After version 2.5, the files use the .MXFR extension.