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From WiX Wiki at MindCapers

Windows Installer is a database driven approach to installing software packages that was developed by Microsoft. WiX, or Windows Installer XML, is an open source tool developed by Microsoft that can be used to specify the contents of a .msi file in XML.

Here is a description of Windows Installer in Microsoft's own words.

Redistributables

• Windows Installer 3.1 Redistributable (v2)
• Windows Installer 3.0 Redistributable
• Windows Installer 2.0 Redistributable for Windows 95, 98, and Me

Utilities

• Windows Installer CleanUp Utility from Microsoft is an essential .msi development tool. If you create a condition where your .msi cannot be uninstalled, this will do the registry cleanup for you, though files installed by your .msi will remain.

FAQs

• Unofficial Windows Installer FAQ at appdeploy.com

VersionNT Property Values

VersionNT is property built into Windows Installer. You might also see Operating System Property Values in the Windows Installer SDK.