Microsoft Msxml 4.20.9818.0 -

This software is considered and a significant security risk.

Older applications (like Toad for Oracle, SQL Server tools, or older games) install it as a necessary dependency. Microsoft Msxml 4.20.9818.0

Microsoft officially ended support for MSXML 4.0 in April 2014 . This software is considered and a significant security risk

You likely didn't install this manually. It usually arrives in one of two ways: SQL Server tools

Because it no longer receives updates, it is frequently flagged by security scanners (like Nessus or Qualys) as a vulnerability.