Aceshigh11.exe is a 32-bit application. I'm not sure what governs whether its 32-bit or 64-bit, but I am pretty sure this decision or setting is made in development or compilation of the code?
We get whatever Hitech wrote it as; we can't change it ourselves. I think it might have to do with the word-size - or how big the registers are, and perhaps if Dale changed to 64-bit the game could address more memory - so maybe bigger skins, more detailed terrain, resolution? etc would be possible. Not sure, but its not a change I would expect to see, unless the conversion to support Vulkan would require it?