Nice one Akira... From the WHDLoad readme for Great Giana Sisters:
That patch applies to Giana Sisters (c) 1988 Timewarp/Rainbow Arts.
That install needs WHDLoad 0.608 and The Patcher1.05 or higher in the path. To install from a different drive than df0: select
Expert as installation mode.
The game requiring Patcher to me suggests that it works with an original game, otherwise DIC would have been used to image it. Try it with your disk and if it fails, send me a warp of the disk and I'll take a look. (You can try Harry first of course but he isn't around much these days).
PS: Due to the small size of the disk image, this game should
run on your A600 from HD