Setup reports XPx64 not supported

```
XP x64 is esentially Windows 2003 x64, which is supported.

I have built the files from source, but I did not see the installer source.

Where is the installer source, so I may test and patch?
```

Original issue reported on code.google.com by `jasonpye...@gmail.com` on 19 Feb 2015 at 1:57
