As shd hasn't answered / mailed back for ages, I did it myself
Using
DJGPP and the excellent RHIDE, I managed to compile a win32 version of xDMS 1.3.2 today!
If anyone wants it too, gimme a shout
The only major modification I had to make was to alias the types unknown from MSDOS/Win32 side (USHORT, ULONG ...) by their standard type names (unsigned short, unsigned long) using a handful of #ifdefs. The rest compiled fine OOTB!
A smashing "nice work!" also to the new maintainer therefore!