Can someone please explain what the setting in the does when set to “YES”?
I tried searching the documentation and forums and could not find anything.
RouterOS 76 stable
And what did you try to search for?
https://forum.mikrotik.com/search.php?keywords=allow-x86-64
https://www.google.com/search?q=site:forum.mikrotik.com+"allow-x86-64"
I searched with both of those, at a minimum, and pretty much everything which came up had the “allow-x86-64” as part of someone doing a config dump and was NOT related to my question.
I did find the below post which someone posted that it “looks” like Mikrotik has now put in 64 bit capability, but there are zero posts/documentation from Mikrotik confirming that this does or does not actually enable 64 bit libraries and such.
http://forum.mikrotik.com/t/ros-7-0b3-64-bit-support-on-x86/135093/1