The MST - Windows Installer Setup Transform File is a Settings file that is a Windows Operating System component and facilitates software installations. This file allowing customized configurations to implemented to during download and installation of software. While containing options to configure certain software as it is installed, the MST file creates the ability for customized parameters to be utilized during the installation process. This type of file is often used in developing software and testing for test configuration versions of software. These files are a part of the install package of MS Windows. The MSI files setting can be used alongside installation packages at the command line. You can use MS Orca Ed. to configure MSI and MST files. Orca is included in the Windows Software Development Kit The MST file format creates and expands installation options.