I am studying a site that uses files ending in .dcr

I think they are Shockwave files but am not sure.

1 - Are they Shockwave files?
2 - If so how can I get them to play from my hard disk?
(found them in the temp internet files folder & wanted to keep
them as a reference)
3 - Is Shockwave a part of Flash or what?
4 - Exactly what does Shockwave do?
5 - Can Swish or SwishMax do what Shockwave does?

Thanks for any help.