How do I use DiskCopy 4.2 images on a Macintosh?
Some (all?) DiskCopy utility programs on the Macintosh require the correct file type and creator type values to be set on disk image files. If you try to open a “.dsk” file with a generic file type, you’ll get an error message claiming that the file format isn’t recognized. The correct values are ‘dImg’ for the file type and ‘dCpy’ for the creator. You can use ResEdit, BBEdit, or Norton Utilities to change the type and creator. If you’re using PC Exchange on the Macintosh to copy the images off of Windows-formatted disks, you can configure it to set the type automatically for “.dsk” files. Take a look at this page for more information.