With deski, you can load numerous reports and exports them in mass. If it is not enouch, you can developp it using a piece of SDK
have a look at this post from Marek Chladny
you can download here a little BO application letting you able to convert / export reports. Maybe you could be inspirate by this and developp a macro achieving this.
ps : Bonjour Seb 
bernard timbal 
(BOB member since 2003-05-26)