we have a file/program with a .dmg extension
our understanding is that it is a Macintosh program
OS X Disk Image File
We do not know what a disk image file is
could somebody please explain it to us and how do we go about opening up the file
do we need a specific software program to open it up ??
is it a valid file/program when it has a .dmg extension ?
your help with this matter is greatly appreciated