[ut2003io] Map download redirects

[Ryan C. Gordon]

> It is possible for the server do deny sending a file - that's a config
> parameter and it produces the kind of error you're seeing on connect.

Can someone please report if they have a system where this doesn't work 
even with the this setting (which one is it, specifically, bus_error?) 
disabled? I'd like to confirm if this is really a bug.

Thanks,
--ryan.