Magick Persistent Cache
From Just Solve the File Format Problem
Magick Persistent Cache (MPC) is a raster graphics format associated with ImageMagick. It is intended to be used for temporary or intermediate data.
The format consists of two files: an .mpc file, and a .cache file. The .mpc file uses a format similar to MIFF, and the .cache file contains raw bitmap data.
Identification
The .mpc file begins with "id=MagickCache
".