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:\Program Files\Vim\vim61\diff -a ' . opt . v:fname_in . ' ' . v:fname_new . ' > ' . v:fname_out
endfunctio

set lines=25
set columns=100
set guifont=courier_new:h12