Website is Gone; Mirror Here

[g-l-i-t-c-h-o-r-s-e]

In case anyone wants information like to implement your own format, here ya go:
https://web.archive.org/web/20160313203835/http://extrafile.org/
https://web.archive.org/web/20160315073854/http://extrafile.org/formats/
https://web.archive.org/web/20160227060135/http://extrafile.org/tutorial/