Not a program I had come across before and a quick search on here just shows one post mentioning it was now part of a toolkit. Looks like it could help in certain situations:
http://www.ghacks.net/2015/11/06/sf...cannow-cannot-repair-windows-file-corruption/
http://www.ghacks.net/2015/11/06/sf...cannow-cannot-repair-windows-file-corruption/
