I've been playing around with DMute on an amiga DMSAVE.DAT file... I'm using DM v3.6 (The Psygnosis one) under WinUAE.
The problem is that if I try to change any dungeon details at all (apart from Player stats and levels etc) it will tell me that the save game file is corrupt when I load it into DM.
I am transferring to and from ADF imges using ADFOpus.
Now, I have the original DM amiga disk (the FTL one (c) Software Heaven 1986) so I could try to adf-rip it and transfer it to PC, (but I seem to recall it was copy-protected, and so it might not work) but the real question I want to ask is has anyone got a customised level to work on the Amiga v3.6, or are you Amiga-users (or emulators
using the original FTL one? And if you have managed to get it to work, was there anything special you had to do? 
(Strangely enough, I recall the same thing happening when using the DM Editor disk on the Amiga so many years ago :-/ )
Thanks for your help,
Chris, a DM fan since '87.