A shot at the InstallDir issue.
Windows host installer: Fixes for non-MSM builds.
Windows host installer: Added merge module (msm) support.
Windows host installaer/VBoxNetCfg: Major overhaul for supporting Windows Installer XML 3.5, fixed VBoxInstallHelper logging, coding style, added missing installer icons.
Added VBOX_VERSION_STRING_RAW to only handle/store the pure VBox version without any suffixes. Fixes bug #8844.
export Windows installer to OSE