CWSDPMI is a DPMI provider, primarily used for djgpp applications (of which
xd.exe is one). It is only necessary if you are going to use xd.exe in a
plain DOS environment (no Windows).

The source and/or updates can be found at:

ftp://ftp.delorie.com/pub/djgpp/current/v2misc/csdpmi*[sb].zip


Similarly, EMU387.DXE provides floating point support for processors lacking
a coprocessor (old 3- and 486s).
