Furthermore, Windows Installer facilitates the principle of least privilege by performing software installations by proxy for unprivileged users. Important features such as rollback and versioning depend on a consistent internal database for reliable operation. Free Windows Installer - MSI Installer Tool Before the introduction of Microsoft Store then named Windows StoreMicrosoft encouraged third parties to use Windows Installer as the basis for installation frameworks, so that they synchronize correctly with other installers and keep the internal database of installed products consistent. Windows Installer is positioned as an alternative to stand-alone executable installer frameworks such as older versions of InstallShield and NSIS. New features include a GUI framework and automatic generation of the uninstallation sequence.
The packages with the file extensions mst contain Windows Installer "Transformation Scripts", those with the msm extensions contain "Merge Modules" and the file extension pcp is used for "Patch Creation Properties". The installation information, and optionally the files themselves, are packaged in installation packagesloosely relational databases structured as COM Structured Storages and commonly known as "MSI files", from their default filename extensions.
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