how to mount sparsebundle?

Can someone please explain how to mount a sparsebundle? When I click on the file in finder I get an error "operation not supported on socket."

Here is what happened: I had a user account with Firevault enabled. I deleted this account and chose the option to save the account as a disk image. The file was created not as a .dmg but as a sparsebundle. But now I can't access the files within the sparsebundle, because I can't get it to mount.

Thanks.