Thank you so much! THAT is THE answer that I needed!
What I discovered now is that with the french culture (fr-FR), the point isn't allowed. But I checked the other culture available, and I found tha there is the swiss french culture (fr-CH) wich is the suitable language, and with it, the point work! It was all about that. Now, i don't understand why by default, the french french (if I can call it that way) is set. But anyway it doesn't matter! Thank you really much!
You’re welcome! Also, the fr-FR should be set by default probably by what you have your Operating System (Windows in this case) set to. Cheers all around!
That's what's strange. The OS is set on swiss french. But anyway, it doesn't matter, I think we can close this chapter on a happy ending. Thank you again.