也被稱為“合併檔案包”。合併模組（.msm檔案）後是一個軟體包，其中包括所有的檔案，資源，註冊表項和安裝邏輯，安裝共享的組件。合併模組包括所有必要的信息，在Microsoft® Windows®安裝程式安裝共享的組件。
合併模組由安裝程式包（.msi）檔案拆分得到。通過Microsoft® Visual Studio® 安裝程式可方便創建.msm檔案以及在.msi檔案中使用它們(.msm)。您可以在合併模組分發您的共享組件，也可以通過在你的.msi檔案相應的.msm檔案使用的共享組件。
以上譯文僅供參考，下方原文方具權威性
Also referred to as "merge package file." A merge module (.msm file) is a single package that includes all files, resources, registry entries, and setup logic to install a shared component. Merge modules include all the information necessary for a Microsoft® Windows® installer to install a shared component.
Merge modules are consumed by installer package (.msi) files. Microsoft® Visual Studio® Installer facilitates both creating .msm files and consuming them in an .msi file. You can distribute your shared components in merge modules, and you can use shared components by including the appropriate .msm files in your .msi file.
