Am 03.01.2016 um 20:05 schrieb Georg Baum:
So far we have never released any 64bit windows binary. This is fine, since 64bit windows can execute 32bit binaries, and nobody complained yet about LyX hitting the 32bit memory limit (around 3.5 GB on windows). I would not switch to 64bit at this time, since this can introduce subtle bugs (unfortunately the 64 C++ memory model differs on linux and windows, e.g. long is 64bit on linux but 32bit on windows, so the fact that we have working 64bit linux builds does not guarantee us working windows 64bit builds).
This is the patch to build for 64bit Windows (with msvc15) https://github.com/syntheticpp/lyx/commit/b249309e84957df512c31b3e5087fbaada681ee9
Georg
