[krbdev.mit.edu #5820] KFW: BUG: WIX: Improve Usability of multiple architecture MSI installations, remove non-unique GUID component identifiers, and include Beta ID in the package name

[Jeffrey Altman via RT]

In response to the uninstall issue.  This appears to be a bug either in
the WiX engine or the Windows Installer 3.1.   The "File" type on the
Registry Search property is supposed to provide the full path name. 
Instead, we are being given just the directory as if it were being
processed with the "Directory" type.

We can avoid this for a REG_SZ value by using the "Raw" type because we
are sure that the string is not going to begin with a '#' character.