Cartography Shop export plugins are simply executeables the program calls with a command line indicating the map to perform an operation on. To use a plugin, simply place it in the "plugins" directory, start the program, and select the plugin from the "plugins" menu. You will be asked to save the map, and the plugin will be run. Exported files will typically appear in your "maps" directory, with the same root name as the map.
If you want to write a custom exporter, take a look at some of the example code.
