https://bugs.winehq.org/show_bug.cgi?id=34342
--- Comment #39 from Daniel Lynn daniel.eric.lynn@gmail.com --- ArenaNet released a beta 64-bit client today. I've been running it all night and haven't had any crashes; additionally, the Gw2-64.exe process *did* surpass the 4GB barrier!
I ran the executable with the wine64 binary to ensure that it ran in 64-bit mode.
This looks like the way to go for 64-bit systems.