Start AppleCommander
Open a DSK image file
Import a file or several files
Close the AppleCommander window (back to the
starting dialog box)
There should be a "Do you want to save this disk
(Y/N) ?" type of question since the contents have
changed.
Otherwise, for newbies like me, you can easily be
flicking through disks without realising that you forgot
to save your changes ... and then you do it all over
again !!!
I've been caught out several times already.
I suspect the same problem would occur if you deleted
a file or changed its attributes.