http://bugs.winehq.org/show_bug.cgi?id=12477
--- Comment #4 from scguy318 nodisgod@yahoo.com 2008-04-17 20:34:44 --- With a bit of recent downtime, I was able to find that the PSetup.exe utility that checks for prerequisites looks for the existence of registry key "HKEY_CLASSES_ROOT\CLSID{000C101D-0000-0000-C000-000000000046}\DllVersion" with default value set to 3.1.4000. Adding the key and setting that default value causes the check for Windows Installer 3.1 to pass and thus the requirement for installing it is eliminated.