MIF - MapInfo Interchange Format File
This is a file format used by the MapInfo geographic analysis and mapping software package. It stores a map visualization in a format which can be used by other third party applications. It can also be used as an exchange format between multiple GIS programs. MapInfo can be used to generate visualizations of several types of data sets including civil engineering information on roads, water mains, etc., demographics and other business intelligence data. NOTE: These files sometimes have a MID (MapInfo Data) file accompanying it which will contain additional spatial information.