Windows Installer Transform Files
A Windows Installer transform (.mst) file provides configuration settings for a customized Office XP installation. A transform file contains information about components, features, setup properties, and changes that you can use to customize your Office XP installation. For example, if there are groups of computers in your organization that all require Microsoft Word and Microsoft Excel to be installed locally, but Microsoft Access and Microsoft PowerPoint® are set to install on demand, you can use a single transform file to configure the installation state you want for that entire collection.
The Office Resource Kit includes a tool called the Custom Installation Wizard that lets you change particular Office XP installation settings and create an .mst file. This file is then distributed with the source files for Office XP, so that the modified settings override the default values in Windows Installer when the installation is initiated on the client.
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