File names with special char

File names with special chars are producing errors when fixture load on Windows OS :+1: 

"php app/console doctrine:fixture:load"
...
 > loading [12] Sonata\Bundle\DemoBundle\DataFixtures\ORM\LoadProductData

  [RuntimeException]
  The file does not exist : D:\www\sonata\site\src\Sonata\Bundle\DemoBu
  ataFixtures\ORM/../data/files/hugo-canada\2010-06-24 a` 13-40-07.jpg