File Type Generic IconWindows Installer Merge Module
File Format Proprietary (Microsoft)
Usage Referenced by an application; not meant to be opened manually
Rank ★ ★ ☆  Average

MSM files are merge modules created for Windows Installer. They are saved in a package format that includes all files, registry entries, and setup information needed to install a shared component.

MSM files are stored within .MSI files, which are the primarily installer files used by Windows Installer. They are referenced during the installation process and are not mean to be opened by the user.

Info About Microsoft Windows Installer

Windows Installer is a utility included with the Windows operating system for installing applications. It extracts files from installer packages and copies them to the locations defined by the installer. The program can be used to install Microsoft software as well as third-party applications. Windows Installer can also be used to remove software that has been previously installed.

Open With

IconMicrosoft Visual Studio

IconMicrosoft Windows Installer

IconOther Windows installation program

Updated April 22, 2010
Information from the PC File Extensions Reference