Windows Installer
Windows desktop packaging SDK
Windows Installer (msiexec.exe, formerly named Microsoft Installer, codename Darwin) is a software component and application programming interface (API) of Microsoft Windows, used to install, maintain, and remove software. The installing information, and optionally the related files, are packaged in installation packages, loosely relational databases structured as COM Structured Storages and commonly known as "MSI files", from their default filename extensions. 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 graphical user interface (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 Nullsoft Scriptable Install System (NSIS).
Before the introduction of Windows Installer, the Windows Setup API can be used in Windows 3.x and Windows 9x. The Setup API can do file copy, as well as INI file or Windows Registry update. Since Windows 2000, use Windows Installer to install application is recommended; Setup API is still used for install device drivers.
Before the introduction of Microsoft Store (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 rollback and versioning depend on a consistent internal database for reliable operation.
Begin with the source’s own compact description: “Windows Installer” is windows desktop packaging SDK. The dossier treats that line as a proposition to test through Windows, Installer and desktop, not as a finished interpretation.
Why this record matters
The phrase “windows desktop packaging SDK” supplies a clear boundary for inquiry. It also exposes the unanswered questions: who defined that boundary, when it became stable and which sources sit outside it.
Named sources, stable identifiers and responsible institutions provide the strongest route from overview to verifiable evidence. The source revision retrieved here is dated Sep 12, 2026. The linked authority identifier is Q181233. 1 of 2 selected statements include explicit references; 2 carry qualifiers and 0 use preferred rank. The first chronological checks are 2000.
Overview language is designed for orientation and should not be treated as a substitute for the evidence cited beneath it. The source lead contains qualifying language; that uncertainty should survive quotation, summary and reuse. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
How to read it
Use the entry as an orientation point, then follow its citations and revision history. Names, dates and institutional relationships should be checked against the original record.
- Subject orientation
- Search vocabulary
- Locating named sources
The closest primary source, responsible institution and strongest cited specialist reference.
Three-step research path
- Establish the record: confirm the title “Windows Installer”, its source revision and the description used here.
- Expand the search: follow Windows Installer primary sources, Windows Installer archive and Windows research across catalogues and specialist indexes.
- Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.
Questions for further research
- Which source most directly establishes the central claim about “Windows Installer”?
- Which cited source is closest to the event, object or claim?
- What terminology or title could unlock a more precise catalogue search?
Search terms from this dossier
This entry incorporates text from “Windows Installer” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.