Yeah, this strikes me as odd considering the UDK/Unreal Editor 3 supports both, and considering a minority of people use 64 bit windows variants, and considering so much other software is only 32 bit compatible
I'd assume it's because TW uses 64 bit operating systems and maybe they just havn't had the time to add 32 support?
No, the reason most likely is that Lightmass can use over 3 GB memory when building lighting for maps. You'll just run out of memory and crash it, being unable to even build the map
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