Well... it's my understanding you'd like to be able to check the integrity of every file in a CD/DVD or a CD/DVD image. I have no solution for that, sorry! However, as your initial post mentions specifically DLLs, I do have a partial solution for that, that may be of interest. Let's see its limitations: Not all files are executables, and for non-executables this won't work. Not all executables are PE files (i.e.: files in the Portable Executable format), and for non-PE files this won't work. No