Thanks a lot Houska. It use to work with r18. But R18 do not support stack material, which is essential for us.
To answer your question, there's no accent in the file name we are using. But probably in our textures names.
We don't have access to the strings of c4d, so we cannot change the accent of 'arrière-plan'. but i think this is the problem:
Attached, you'll see that c4d clearly translate 'layer : Arrière-plan' as Background, when clicking on 'select..'
Can you keep us informed, Thanks in advance,
Nelaton