Windows Installer File Name Extensions

The following file name extensions are used with the Windows Installer.

Extension Description
.msi Windows Installer Database.
.msm Windows Installer Merge Module.
.msp Windows Installer Patch.
.mst Windows Installer Transform.
.idt Exported Windows Installer Database Table.
.cub Validation module.
.pcp Windows Installer Patch Creation File

 

Installation Package

Merge Modules

Patch Packages

Transforms

Importing and Exporting

Sample .CUB File