The schema version is an integer that identifies the minimum Windows Installer version that is required for the installation package.

To override the schema version that is specified for your project in the Summary Information Stream area of the General Information view, enter the appropriate integer. The value that you enter for the product configuration overrides any value that you specify in the General Information view.

For example, if your package requires at least version 1.1 of the Windows Installer engine, enter 110 for this setting.

If the end user¡¯s system has a Windows Installer version earlier than the minimum requirement specified in the Schema setting—for example, if you specify a schema value of 120 and the end user has Windows Installer 1.0—the installation displays an error message and exits.

If you are including the Windows Installer 1.2 engine with your installation, enter 110 for this setting.

The value that you enter for the Schema setting is used for the Page Count Summary property of your .msi file.