W indows Installer 3
The Windows Installer service defines and manages a standard format for application setup, installation, and upgrades. It tracks components such as groups of files, registry entries, and shortcuts. Windows Installer is a system-resident installation service that provides consistent deployment, enabling administrators and users to manage shared resources, customize installation processes, make decisions on application usage, and resolve configuration problems. Windows Installer 3.0 is a new version of the service that is included in Windows XP Service Pack 2.
Windows Installer 3.0 has enhanced inventory functions that identify what patch components do and don't need to be downloaded, and supports Microsoft's delta compression technology, which makes patches smaller. Windows Installer 3.0 also supports more reliable patch removal.
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