Opening .hsc,.hmi,.hsi sprite files

[thizze]

Hello everyone I am trying to rip sprites from the now shut down 2d mmo Windslayer. I have an old game folder with all the files within; the problem comes from the image files. All the image files except for some basic ui files are in .hsc,.hsi,.hmi. I have been looking around for a good month or so and have come up with nothing useful in opening these files. If anyone knows anything about extracting the images from these file formats the information would be much appreciated.
Thank you.