When a Backup Disk Image is split into several files, the image description is placed into the last file of the archive.
If all files are located in the same folder, you may select any file of the image. The application will automatically locate the last file of the archive and read the backup information. If the last file cannot be found, you must locate the last archive file and select it to open the image.
This error can also occur if you attempt to use Active@ Disk Image v3.x to restore an image which was created with v4.x. You will need to recreate your boot CD with the current version of disk image software Active@ Disk Image on it and then restore again.