I have been trying, without any success, to get the above AmigaDisk.img recognised by Amiberry - a fork of UAE - as I am guessing that the fs is either Smart File System. Professional File System or maybe fro OS 3.9 - which might not be compatible with the kernel. It could also be Affs, but patched using ide-fix97
Have you tried to look at the drive in Amiberry with HDToolbox. I guess that should give you the file system. Also I think you should be able add file system to the boot record of the drive.