How can MD5 be used to identify files .. ? Suppose if I split the files according to my liking and customize the RAR compression according to my parameters, then chances of getting the exact same MD5 as what they may have on file will be virtually zero .. Or am I missing some basic point ?

EDIT: How make link updating process easier, so that I don't have to manually edit my posts on all forums, how about I just post the folder link in forums, and then just shift around the files there ?