Hello gurus!

I have a problem: the transfer of a dvd iso was interrupted after 2 GB or so, and then continued and completed. Unfortunately, the "continuation" was actually just a new complete transfer appended to the preexisting incomplete file, so the final size is 6.7GB instead of 4.7GB. All the data is there, but the first 2GB is the incomplete transfer. Before I can do anything with the ISO I have to remove the redundant and incomplete first 2GB of the file. How could I do this? Due to time and bandwidth constraints it is not possible for me to begin the transfer anew.

Thanks for any help...