We had a 60 Gigabyte zip file which would not open. Advanced Zip Repair could not repair it as it was too large. However, DataNumen provided me with another great piece of software whcih split the file into more manageable 1 Gigabyte files, and then Advanced Zip Repair successfully repaired every single one. We had tried a variety of other repair products without success, so I will certainly be coming back to DataNumen if we have any other data problems in future. Invaluable products and great support!