git diff with gvim on Windows

.gitconfig

[core]
  excludesfile = ~/.gitignore_global
  editor = gvim
  autocrlf = false
  safecrlf = false
[user]
  email = schmch@gmail.com
  name = Chris Schmich
[push]
  default = current
[alias]
  st = status --ignore-submodules=all
  stat = status --ignore-submodules=all
  ci = commit
  lg = log --color --graph --pretty=format:'%Cred%h%Creset -%C(yellow)%d%Creset %s %Cgreen(%cr)%C(bold blue) <%an>%Creset' --abbrev-commit
  df = difftool
[color]
  ui = true
[diff]
  tool = gvimdiff
[difftool "gvimdiff"]
  cmd = "gvim -c 'set columns=250' -c 'wincmd =' -d" "$LOCAL" "$REMOTE"
[difftool]
  prompt = false
[merge]
  conflictstyle = diff3
[filter "lfs"]
  clean = git lfs clean %f
  smudge = git lfs smudge %f
  required = true

C:\Windows\gvim

#!/bin/sh
exec "/c/Program Files (x86)/Vim/vim74/gvim.exe" "$@"