If you are trying to download Bootcamp, where are you getting it from? That file name you show is not even a Mac file. It's a .dll file, which is Windows only, it's a Dynamic Link Library, and would never be used on a Mac.
If you have Leopard on your iMac and you have your install disks, you already have Bootcamp. No need to download.
So whatever you think you are downloading, it looks like it's totally bogus.
