Save and load images to file

Hi guys, I know you can take a snapshot of the screen or a sprite, but how can I save that to a file?

And then, how do I load the file into a sprites image?

The only option I get at runtime is load image from URL. Maybe Im missing something, but it would be great if it was possible:-)

Bump, any suggestions?

Just saw this post right before yours, sorry if it's too late:

http://www.scirra.com/forum/demo-save-images-on-disk_topic59053.html