A key feature is the integration of the "POSReady trick," which allowed standard XP systems to receive security updates intended for industrial embedded systems (which had support until 2019).
If you download an authentic-looking "XP SP4 ISO" from Archive.org (specifically the 2019-era uploads by users like Dibya or TechGuy ), what patches are included? A true slipstreamed "SP4" typically contains: windows xp sp4 iso archive.org
Unofficial SP4 was primarily developed by a Greek developer known as starting in 2013. It is a cumulative update rollup for the 32-bit (x86) version of Windows XP. A key feature is the integration of the
Microsoft .NET Frameworks (versions 1.0, 1.1, 3.5, and 4.0) and DirectX 9.0c. It is a cumulative update rollup for the
This is not an official Microsoft release. Microsoft ended support for XP in 2014 (and for POSReady 2009 in 2019). "SP4" is a community-made, unofficial update pack.