.iso and .md5 files is it?

If someone could help me here it would be great thanks.
Before i knew much about the whole dvd backup process i got a lend of a load of dvd's off someone to back them up. My plan was to just use Dvd Decrypter to decrypt in iso read mode and then to burn the image in iso write mode. However, when i inserted the dvds i realised they were larger than 4.7 gigs. I now know you can use programs like dvd shrink to back them up but at the time i didn't I had to give the dvds back so all i did was rip all the dvd's using dvd decrypter in iso read mode. So now i have a load of whatever.iso and whatever.md5 files but i don't know if i can do anything with them? I don't seem to be able to use dvd shrink on a .iso or .md5 file. Can anybody help me?

 

HELP!!!