function MyDiffWin()
  let opt = ""
  if &diffopt =~ "icase"
    let opt = opt . "-i "
  endif
  if &diffopt =~ "iwhite"
    let opt = opt . "-b "
  endif
  execute '! ls '. v:fname_in
  silent execute "!/bin/diff.exe -a --binary " . opt . v:fname_in . " " . v:fname_new . " > " . v:fname_out
endfunction
set diffexpr=MyDiff()

:! ls /home/mobaxterm/tmp/vD9PXDX/0

Command terminated