Hello all. This has been a little annoyance to me - despite the inclusion of the 'Honorbuddy Launcher', the force start of WoW-64bit. I've attempted adding a line in the Config.wtf within the WTF folder to no avail; however I did find a "fix". I archived Wow-64.exe (just to keep it somewhere) and deleted the exe itself. As soon as the 64 bit edition is removed from the folder - WoW will always begin in 32bit mode. Problem solved.
Once you delete the .exe the Launcher will restore it within some time. Just a heads up, not that easy. But its pretty easy to use the Honorbuddy.Launcher.exe - which launches 32bit(x86) without problems. And without modifying the WoW-Folders content.
I think the mods need to put a code in the forum to where if there is a number of 32 or 64 then that person should automatically receive a 5 day forum ban.