I thought you might be interested in looking at Question for developers? Why isnt ARMA 3 64 bit so it can use more or our system ram?.
https://forums.bohemia.net/forums/topic/180561-question-for-developers-why-isnt-arma-3-64-bit-so-it-can-use-more-or-our-system-ram/?do=findComment&comment=2846363
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