World Builder save problem

[Warmessiah]

Dotn worry about the title, im ok i realized it, but now i got another prob....

when i open very large world builder maps my game crashes. It loads, I can see it on the minimap, but in a flash it just shuts down with an error message....

Any help? I really need a middle east map for a scenario I am making but it is very big... if you cant fix the problem, can you show me a smaller version of the middle east (inc. Egypt and a bit of russia if possible)

I have a great up to date graphics card....