I do not expect the user, when wanting to run the program, to type in "java -cp .;C path_to_jar_file;C path_to_jar_file\path_to_images_dir -Xmx256M -jar myprogram.jar" at the command prompt everytime.

As I can find no place where the File object's path property was ever documented (it seems it was just sneakily implemented one day by the Chrome team far in the past), it doesn't seem to harm ...