Note the case difference in these registry settings between SOFTWARE and Software.
Items in HKEY_CURRENT_USER\Software\Harlequin\MLWorks\
Source PathThe compilation system source path.
Pervasive PathStartup Directory .mlworks and .mlworks-preferences.
Items in HKEY_LOCAL_MACHINE\SOFTWARE\Harlequin\MLWorks\2.0\
LicenseSaved registration information.
UserSaved registration information.