Msxml 4.20.9818.0: Microsoft

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 Microsoft Msxml 4.20.9818.0

You likely didn't install this manually. It usually arrives in one of two ways: It was commonly included in or updated via

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

4.20.9818.0 is an older sub-version of SP2. Even the "newer" SP3 (version 4.30.2100.0) is also now unsupported. 🛠️ Why is it on your computer?

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 Critical Status: Obsolete and Insecure