Why is Quartus II programmer checksum different than general checksum calculations of the .pof or .jic?

Description

The Quartus® II programmer calculates the checksum using only the data which will be programmed to the configuration device. The programmer object file (.pof) or JTAG Indirect Configuration file (.jic) has additional file information which is not programmed into the configuration device, the checksum calculated from the entire .pof  or .jic is therefore not identical to the one programmer displays.