You can find more details here. Check out the program's official web site here.
Screenshot (click to enlarge).
PNGcheck is an archive utility that enables you to extract or list contents of files containing only PNG image data. The archiving feature has been incorporated into this utility's user interface. The program comes with an option to display files in either PNG or raw graphic modes, and different interfaces are available for each one of them. You can opt to view images by size or 50e0
