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About Merge Modules

Merge modules are essentially simplified .msi files, which is the file name extension for a Windows Installer installation package. A standard merge module has an .msm file name extension.

A merge module cannot be installed alone because its lacks some vital database tables that are present in an installation database. Merge modules also contain additional tables that are unique to themselves. To install the information delivered by a merge module with an application, the module must first be merged into the application's .msi file.

A merge module consists of the following parts:

Multiple language merge modules can deliver components to an installation package in multiple languages. In a multiple language merge module the database contains the installation properties and logic for more than one language and the MergeModule.CABinet cabinet includes all the files necessary to install components with all the languages supported by the module.