It must be a Bitcomet or Bittorrent file.
Found this by Googling bc file format
http://www.moviecodec.com/topics/8947p1.html
"Trev" <> wrote in message
news:6C4E45ED-64D0-414E-88AB-...
> I'm not refering to the birth of christ ! i downloaded these file b 4 and
> i
> had no problems when i had xp pro.But now that i reformated my pc and
> installed vista ultimate those same files will not open after the dl
> completes.it says bc file and pops up search for the proper program to
> open
> file .Is it a security problem or does anyone now how to fix or change the
> file so it will open thank to those that r helpfull in advance
>
> "kirk jim" wrote:
>
>> can you translate " it says bc file" into something we can understand?
>>
>>
>> "Trev" <> wrote in message
>> news:2BC9AF1D-CCBD-4A4C-AF9C-...
>> >I have downloaded files like i usually did when i had windows xp pro.now
>> >when
>> > i dl programs it says bc file and it won't let me open the file.can
>> > anyone
>> > help me with this problem? i would greatly appreciate it tnx in advance
>>
>>
>>