Comparing binary files

(This thread is a spin-off from this: http://dis.4chan.org/read/comp/1182083741/1-40)

I downloaded 7 linked RARs from Rapidshare. I think that I might've accidentially renamed one RAR during the saving so that I have two identical files with different names.

Could you please tell me if there's some program that can compare binary files and eliminate the possibility of duplicates?

>>4 So you're saying that you don't know of any quick and easy program to compare binary files with? Only arcane machine code or big and unwieldy programs with lots of spyware in the trial version?