CPC (Cartesian Perceptual Compression) algorithm is designed for compressing 1-bit raster images, such as black-and-white photographs and line art; often used for compressing monochrome design layouts, legal documents, and other types of scanned text files.
To View files in IE install ActiveX plugin from
To convert CPC files into JPG use command line tool CPCTool-523-Win32-X86.zip
source.cpc -O destination.jpg
For more switched run CPCTool without any parameters.