Windows Installer (msiexec.exe, previously known as Microsoft Installer,

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Darwin) is a

software component Component-based software engineering (CBSE), also called component-based development (CBD), is a branch of software engineering that emphasizes the separation of concerns with respect to the wide-ranging functionality available throughout a give ...

and application programming interface (API) of Microsoft Windows used for the installation, maintenance, and removal of software. The installation information, and optionally the files themselves, are packaged in ''installation packages'', loosely

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s structured as

COM Structured Storage COM Structured Storage (variously also known as ''COM structured storage'' or '' OLE structured storage'') is a technology developed by Microsoft as part of its Windows operating system for storing hierarchical data within a single file. Stri ...

s and commonly known as "MSI files", from their default

filename extension A filename extension, file name extension or file extension is a suffix to the name of a computer file (e.g., .txt, .docx, .md). The extension indicates a characteristic of the file contents or its intended use. A filename extension is typically ...

s. 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". Windows Installer contains significant changes from its predecessor, Setup API. New features include a

GUI The GUI ( "UI" by itself is still usually pronounced . or ), graphical user interface, is a form of user interface that allows users to interact with electronic devices through graphical icons and audio indicator such as primary notation, inste ...

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

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and NSIS. Before the introduction of

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(then named Windows Store), Microsoft 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. Important features such as

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and versioning depend on a consistent internal database for reliable operation. Furthermore, Windows Installer facilitates the

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by performing software installations by proxy for unprivileged users.

Logical structure of packages

A package describes the installation of one or more full ''products'' and is universally identified by a

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. A product is made up of ''components'', grouped into ''features''. Windows Installer does not handle dependencies between products.

Products

A single, installed, working program (or set of programs) is a ''product''. 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 product's files and registry keys. A ''package'' includes the package logic and other metadata that relates to how the package executes when running. For example, changing an

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in the product may require the ProductCode or ProductVersion to be changed for the release management. 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.

Features

A ''feature'' is a hierarchical group of components. A feature may contain any number of components and other sub-features. Smaller packages can consist of a single feature. More complex installers may display a "custom setup" dialog box, from which the user can select which features to install or remove. The package author defines the product features. A

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, for example, might place the program's core file into one feature, and the program's help files, optional spelling checker and stationery modules into additional features.

Components

A ''component'' is the basic unit of a product. Each component is treated by Windows Installer as a unit. The installer cannot install just part of a component. Components can contain program

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, folders,

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components,

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keys, and shortcuts. The user does not directly interact with components. Components are identified globally by GUIDs; thus the same component can be shared among several features of the same package or multiple packages, ideally through the use of

Merge Module A merge module is a special kind of Windows Installer database that contains the components needed to install a discrete software bundle. A merge module cannot be installed alone, but must be merged into a standard Windows Installer installation ...

Key paths

A ''key path'' is a specific file, registry key, or

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data source that the package author specifies as critical for a given component. 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 component's 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. This process is known as ''self-healing'' or ''self-repair''. No two components should use the same key path.

Developing installer packages

Creating an installer package for a new application is not trivial. It is necessary to specify which files must be installed, to where and with what registry keys. Any non-standard operations can be done using Custom Actions, which are typically developed in DLLs. There are a number of commercial and freeware products to assist in creating MSI packages, including

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(natively up to VS 2010, with an extension on newer VS versions),

and WiX. To varying degrees, the user interface and behavior may be configured for use in less common situations such as unattended installation. Once prepared, an installer package is "compiled" by reading the instructions and files from the developer's local machine, and creating the .msi file. The user interface (dialog boxes) presented at the start of installation can be changed or configured by the setup engineer developing a new installer. There is a limited language of buttons, text fields and labels which can be arranged in a sequence of dialogue boxes. An installer package should be capable of running without any UI, for what is called "unattended installation".

ICE validation

Microsoft provides a set of Internal Consistency Evaluators (ICE) that can be used to detect potential problems with an MSI database.Internal Consistency Evaluators – ICEs
/ref> The ICE rules are combined into CUB files, which are stripped-down MSI files containing custom actions that test the target MSI database's contents for validation warnings and errors. ICE validation can be performed with the Platform SDK tools Orca and msival2, or with validation tools that ship with the various authoring environments. For example, some of the ICE rules are: * ICE09: Validates that any component destined for the System folder is marked as being permanent. * ICE24: Validates that the product code, product version, and product language have appropriate formats. * ICE33: Validates that the Registry table is not used for data better suited for another table (Class, Extension, Verb, and so on). Addressing ICE validation warnings and errors is an important step in the release process.

Versions

References

External links

* {{Authority control Installation software Microsoft application programming interfaces Windows administration Windows components