As documented here, it is possible to bypass registry redirection when running a 32bit application on a 64bit Windows installation, using HKLM64 or HKCR64. I quote:
In this thread, >this feature's existence is denied.
Also, if this feature exists and works, does it work on both production and beta? And can I also specificy HKEY_LOCAL_MACHINE64 and HKEY_CLASSES_ROOT64 instead of HKLM64 and HKCR64?