Windows Installer 3.04/19/2021
Any non-standard operations can be done using Custom Actions, which are typically developed in DLLs.Please help improve this article by adding citations to reliable sources.Find sources: Windows Installer news newspapers books scholar JSTOR ( May 2020 ) ( Learn how and when to remove this template message ).
For the installation of the operating system itself, see Windows Setup. Developer(s) Microsoft Initial release 31 August 1999; 21 years ago ( 1999-08-31 ) Stable release 5.0. The installation information, and optionally the files themselves, are packaged in installation packages, loosely relational databases structured as COM Structured Storages and commonly known as MSI files, from their default filename extensions. Windows Er 3.0 Patch Creation PropertiesThe 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. Windows Installer contains significant changes from its predecessor, Setup API. New features include a GUI framework and automatic generation of the uninstallation sequence. Windows Installer is positioned as an alternative to stand-alone executable installer frameworks such as older versions of InstallShield and NSIS. Important features such as rollback and versioning depend on a consistent internal database for reliable operation. Windows Er 3.0 Software Installations ByFurthermore, Windows Installer facilitates the principle of least privilege by performing software installations by proxy for unprivileged users. Windows Installer does not handle dependencies between products. A product is identified by a unique GUID (the ProductCode property) providing an authoritative identity throughout the world. The GUID, in combination with the version number (ProductVersion property), allows for release management of the products files and registry keys. ![]() However, merely changing or adding a launch condition (with the product remaining exactly the same as the previous version) would still require the PackageCode to change for release management of the MSI file itself. A feature may contain any number of components and other sub-features. More complex installers may display a custom setup dialog box, from which the user can select which features to install or remove. A word processor, for example, might place the programs core file into one feature, and the programs help files, optional spelling checker and stationery modules into additional features. The installer cannot install just part of a component. Components can contain program files, folders, COM components, registry keys, and shortcuts. Because a file is the most common type of key path, the term key file is commonly used. A component can contain at most one key path; if a component has no explicit key path, the components destination folder is taken to be the key path. When an MSI-based program is launched, Windows Installer checks the existence of key paths. If there is a mismatch between the current system state and the value specified in the MSI package (e.g., a key file is missing), the related feature is re-installed. It is necessary to specify which files must be installed, to where and with what registry keys.
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