I'm not sure if this will help, but anyway...
I believe it is possible to open a bank account in your personal name, including a title - say Bernard Languillier, President, Bernard Languillier Images. Just print up some stationery in the name of the business. If I remember correctly, your exhibition in Tokyo was in a bank? They might be able to help, perhaps. Also, I've been told that unless there's a K.K. or similar after the name of the business, it generally means that the business is unincorporated.
Please feel free to correct me