MSI Transforms

Transforms allow you to customize MSI-based software, for example by adding or changing files, links or registry keys.

When installing a package, the Windows Installer executes the transforms; they are stored locally (cached) and used for uninstallation and Auto Repair. Several transforms per MSI Package can be executed at one time. Transforms are stored in an .MST file.

It is not possible to use transforms to change MSI-based software that have already been installed.