More info on this. The installer detects whether you're running a 64-bit or 32-bit operating system, so it has to be 32-bit. Based on that determination, it then installs the proper version. Since we didn't want to uninstall the old 32-bit version when we first released the 64-bit Beta, we opted to install them side-by-side, which is in the x86 directory on 64-bit Windows. The plan was to fix this for the official release, installing on the correct version and in the correct location, but it seems that didn't get done. So that's back on the punch list, where it should have been previously.
As you confirmed, though, it is indeed running the correct version for you. That's the most important thing.
