U.n.k.n.o.w.n.
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U.n.k.n.o.w.n., Possibly. On a 64-bit system, "Incredible" size maps also didn't work until I removed the limitation from the executable file that prevented it from using more than 2GB of RAM. But your video card is also quite weak... Although, I think it will just cause the game to lag, rather than crash, although I might be wrong.
Check it, and let me know the result ;)
Added 25 minutes ago
I performed the procedure to remove the RAM limitation from 2 to 3 GB, put EWA_VisualWorld.pak back into the data folder, launched the game through the launcher with standard settings, and the result is still the same - the game crashes when trying to play maps that have indices before the name: A1, A2, B1, B2, E1, E2 (these relate only to Multiplayer maps and single-player scenarios, regardless of the map size, whether it's small or incredible). Although all maps that have the index H5 before the name load for me when EWA_VisualWorld.pak is in the data folder.