win_friendly_path.rb

# include Windows::Helper from Opscode Windows Cookbook
::Chef::Recipe.send(:include, Windows::Helper)

# now you can call helper methods like win_friendly_path directly
my_batch_file = win_friendly_path(
                     ::File.join( node['cookbook']['batch_dir'],'foo.bat'))

execute "My batch file" do
  command my_batch_file
  creates "e:/logs/my_batch_file.log"
end

I find that this doesn't work. My path still has single slashes \
https://gist.github.com/spuder/f1eeecc65b2b8245258e#comment-1483481