It's working ! Thx !
I hexedited executable and made a little script to launch it from HD. It works on AmigaOS 3.1 ;)
If your disk floppy is named VEG:, it should also work from floppy.
You can find an lha package of this "HD version" here : http://batteman.free.fr/amiga/VegetablesHD.lha