Have you considered using Web Services instead of CORBA? Or is it too late/complicated to make such a change? It's not a drop in change, but they've already addressed moving large attachments, so maybe Web Services will solve the problem.
But, then again, it may be too difficult to switch to Web Services (they have there own challenges, that's for sure), so using CORBA for your main interface, with the large attachments being special cases.
You can use something like Apaches Common HTTPClient to get files pretty easily, if that works for you.
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