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Windows Installer
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From Wikipedia, the free encyclopedia
This article is about the Microsoft Windows component. For the installation of the operating system itself, see Windows Setup.
 Help screen of Windows Installer 5.0 running on Windows 7 | |
| Original author(s) | Microsoft |
|---|---|
| Initial release | 31 August 1999 |
| Stable release | 5.0 / 22 July 2009[1] |
| Operating system | Microsoft Windows XP or higher |
| Platform | x86, x86-64, Itanium |
| Type | Installer |
| License | Proprietary |
| Filename extension | .msi, .msp |
|---|---|
| Internet media type | application/x-ole-storage, text/mspg-legacyinfo |
| Developed by | Microsoft |
| Extended from | Cabinet (file format) |
| Open format? | No |
The Windows Installer (previously known as Microsoft Installer[3]) is asoftware component used for the installation, maintenance, and removal of software on modern Microsoft Windows systems. The installation information, and often the files themselves, are packaged in installation packages, looselyrelational databases structured as COM Structured Storages and commonly known as "MSI files", from their default file extension. Windows Installer contains significant changes from its predecessor, Setup API. New features include a GUI framework and automatic generation of the uninstallationsequence. Windows Installer is positioned as an alternative to stand-alone executable installer frameworks such as older versions of InstallShield andNSIS.
Microsoft encourages 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. Important features such as rollback and versioning depend on a consistent internal database for reliable operation. Furthermore, Windows Installer facilitates theprinciple of least privilege by performing software installations by proxy for unprivileged users.
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