what does something with an extension .bc! mean

[live4soccer7]

What does it mean an something has an extension of .bc! I have seen this with bittorrent downloads. What does it mean... Thanks for any help

[Luciel]

bitcomet? just a wild guess :o

[kosmiq]

.bc! is an extencion added by BitComet during the files download process.
That is an option avaible in Bitcomet to add that (selected by default).

So as long as the file(s) in the torrent is between 0 and 99.99% it has ".bc!" in it.

[copy2012]

I think its before .AD