my gvim for windows configuration

gvim install version

"==============
" default
"==============
set nocompatible
source $VIMRUNTIME/vimrc_example.vim
source $VIMRUNTIME/mswin.vim
behave mswin
set diffexpr=MyDiff()


"Set to auto read when a file is changed from the outside
set autoread

"Have the mouse enabled all the time:
set mouse=a

"Turn on WiLd menu
set wildmenu

"Always show current position
set ruler

set fen
set fdl=0

"==============
" tab
"==============
set shiftwidth=4
set sts=4
set tabstop=4
set expandtab

"==============
" backup
"==============
set nobackup
set nowritebackup

"==============
" smart code
"==============
if has("eval")
filetype plugin on
filetype indent on
endif
set ignorecase smartcase
set cindent
syntax on

"==============
" appearance
"==============
set nu
autocmd GUIEnter * simalt ~x

"==============
" plugins
"==============
:autocmd BufEnter * call DoWordComplete()
set tags=tags;
set autochdir
let Grep_Path = 'x:\xx\grep.exe'
let Tlist_Show_One_File=1
let Tlist_Exit_OnlyWindow=1


function MyDiff()
  let opt = '-a --binary '
  if &diffopt =~ 'icase' | let opt = opt . '-i ' | endif
  if &diffopt =~ 'iwhite' | let opt = opt . '-b ' | endif
  let arg1 = v:fname_in
  if arg1 =~ ' ' | let arg1 = '"' . arg1 . '"' | endif
  let arg2 = v:fname_new
  if arg2 =~ ' ' | let arg2 = '"' . arg2 . '"' | endif
  let arg3 = v:fname_out
  if arg3 =~ ' ' | let arg3 = '"' . arg3 . '"' | endif
  let eq = ''
  if $VIMRUNTIME =~ ' '
    if &sh =~ '\<cmd'
      let cmd = '""' . $VIMRUNTIME . '\diff"'
      let eq = '"'
    else
      let cmd = substitute($VIMRUNTIME, ' ', '" ', '') . '\diff"'
    endif
  else
    let cmd = $VIMRUNTIME . '\diff'
  endif
  silent execute '!' . cmd . ' ' . opt . arg1 . ' ' . arg2 . ' > ' . arg3 . eq
endfunction