It was commonly included in or updated via Windows XP, Vista, and Windows 7. ✅ Should you keep or remove it? Microsoft XML Core Services 4.0 - Microsoft Lifecycle
Note. Support for XML Core Services 4.0 has ended. Support was only available for Service Pack 3. Microsoft Learn
You likely didn't install this manually. It usually arrives in one of two ways: Microsoft Msxml 4.20.9818.0
Older applications (like Toad for Oracle, SQL Server tools, or older games) install it as a necessary dependency.
Microsoft officially ended support for MSXML 4.0 in April 2014 . It was commonly included in or updated via
Microsoft MSXML 4.20.9818.0 is a specific version of . It is an older system component used by legacy Windows applications to parse and process XML data. Critical Status: Obsolete and Insecure
Because it no longer receives updates, it is frequently flagged by security scanners (like Nessus or Qualys) as a vulnerability. Support for XML Core Services 4
This software is considered and a significant security risk.