Microsoft has not yet ended support for the embedded version of XP for ATMs and point of sale systems. They come from the point of sale/ATM version of XP that's still in use. However, SP4 also adds security fixes that aren't technically part of commercial Windows XP.

That's a lot of fixes, so it would be tempting to use it. So it's mostly a rollup of monthly fixes issued by Microsoft since the third service pack, which came out in 2008. NET 1.x, 3.5 versions are automatically installed/updated in live installations NET Frameworks 4.0, 3.5, 1.1 and 1.0 (Tablet PC only) Updates for most Windows XP components, including MCE and Tablet PC.For this reason, I started working on a Service Pack 4 package,' harkaz wrote on the RyanVM discussion boards, which appears to be a board dedicated to patching and updating Windows operating systems. “Many users – including me – who won’t be able to upgrade their old machines to a newer OS would like to easily install all Windows updates in one convenient package. Harkaz started the project back in September 2013 and is on his third beta, with a 'Release Candidate' coming soon. The 'Unofficial Service Pack 4' comes from a Greek developer who uses the online name 'harkaz.' Using a screen name makes me distrustful on reflex. Five months after Windows XP was cut loose by Microsoft, a well-meaning developer is putting together a fourth service pack for the 13-year-old operating system.

Windows xp sp4 unofficial