Select the version of the Windows Installer engine that you want to include with your application. You must select one of the Yes options in the Setup Launcher property to enable installing the Windows Installer engines with your package.

The Version 3.1 or 2.0 (best fit for system) option installs Windows Installer 3.1 on target systems that are running Windows 2000 SP3 or later; it installs Windows Installer 2.0 on other target systems.

- Windows Installer 2.0 requires SP6 on Windows NT 4 platforms; Windows Installer 1.1 and Windows Installer 1.2 require SP3 on Windows NT 4 platforms.
- If you select version 1.1 or 1.2, the minimum installer version (schema) of your package for this release is set to 110, overriding the Schema property for the Summary Information Stream in the General Information view and in this Product Configuration. If you choose to include the Windows Installer engine with your installation, this property determines if version 1.2 or version 2.0 of the Windows Installer engine is installed.