Metafile

A metafile can refer to two different types of computer files. The first is a file that describes the contents of other files. This type of metafile may contain metadata, which defines a group other files and gives a summary of what data they contain.

The second type of metafile is most often used in computer graphics. These files define objects and images using a list of coordinates. They are typically used for vector images, such as Adobe Illustrator, CorelDRAW, and EPS files, but can include raster images as well.

Definition from the Tech Terms Computer Dictionary
http://www.techterms.com/definition/metafile