The Windows Assessment and Deployment Kit (ADK) is a collection of tools used to customize, assess, and deploy Windows operating systems to new computers.
The file adk toolkit documentation-x86-en-us.msi is a standalone Windows Installer package specifically for the user guides, help files, and technical manuals associated with the ADK tools (such as Image Builder, Windows PE, and the Application Compatibility Toolkit).
If you cannot locate the adk toolkit documentation-x86-en-us.msi download because Microsoft has retired the specific version you need, consider these alternatives:
If you saw a file named exactly as you described on a third-party site, do not download it — it is not an official Microsoft package and could be unsafe.
Would you like the direct link to the official Windows ADK download page, or instructions for installing just the Assessment Toolkit documentation?
Note: This keyword is highly specific and appears to be a fragmented filename from legacy Microsoft ADK (Assessment and Deployment Kit) documentation packages. The following article clarifies what this file is, where to find it, official alternatives, and troubleshooting steps.
If you need the legacy Windows Help format (HXS or MSHC), you must install an older ADK version (e.g., 1607, 1809). Microsoft has archived these.
How to get the old x86 documentation:
This will generate the adk toolkit documentation-x86-en-us.msi inside a temporary folder (%temp%), but you should not need to extract it manually.