set nocompatible
source $VIMRUNTIME/vimrc_example.vim
source $VIMRUNTIME/mswin.vim
behave mswin

set diffexpr=MyDiff()
function MyDiff()
  let opt = ''
  if &diffopt =~ 'icase' | let opt = opt . '-i ' | endif
  if &diffopt =~ 'iwhite' | let opt = opt . '-b ' | endif
  silent execute '!C:\Vim\vim62\diff -a ' . opt . '"' . v:fname_in . '" "' . v:fname_new . '" > "' . v:fname_out . '"'
endfunction